You may have this creature enter as a copy of any creature on the battlefield, except it isn't legendary, is an artifact in addition to its other types, and has myriad. (Whenever it attacks, for each opponent other than defending player, you may create a token copy that's tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.)

Flying Whenever this creature enters or attacks, target opponent sacrifices a creature or planeswalker of their choice, discards a card, and loses 3 life. You draw a card and gain 3 life.

Flying, deathtouch When this creature enters, draw a card.

{2}, {T}: Draw a card, then discard a card. Create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.) At the beginning of your end step, if you have the initiative, draw a card. Draw another card if you've completed a dungeon. Choose a Background (You can have a Background as a second commander.)

Flying {T}: Draw a card, then discard a card. {X}: This creature becomes a copy of target creature card in your graveyard with mana value X, except it has flying and this ability. Activate only as a sorcery.

Flash Flying Whenever Malcolm deals combat damage to a player, put a chorus counter on it. Draw a card, then discard a card. If there are four or more chorus counters on Malcolm, you may cast the discarded card without paying its mana cost.

Cumulative upkeep {1} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) Whenever an opponent casts a noncreature spell, you may draw a card unless that player pays {4}.

When you cast this spell, draw two cards. Flying Annihilator 1 (Whenever this creature attacks, defending player sacrifices a permanent of their choice.) Evoke {2}{U} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

This creature can't be blocked. Whenever this creature deals combat damage to a player, choose one that hasn't been chosen — • Put two +1/+1 counters on this creature. • Draw a card. • This creature becomes a copy of another target creature you control.

When Acererak enters, if you haven't completed Tomb of Annihilation, return Acererak to its owner's hand and venture into the dungeon. Whenever Acererak attacks, for each opponent, you create a 2/2 black Zombie creature token unless that player sacrifices a creature of their choice.

Commander creatures you own have "Room abilities of dungeons you own trigger an additional time."

Enchant creature Enchanted creature has flying and "Whenever this creature deals combat damage to a player, venture into the dungeon." (Enter the first room or advance to the next room.)

Room abilities of dungeons you own trigger an additional time.

Vigilance Whenever Nadaar enters or attacks, venture into the dungeon. (Enter the first room or advance to the next room.) Other creatures you control get +1/+1 as long as you've completed a dungeon.

Flying Whenever this creature attacks, venture into the dungeon. (Enter the first room or advance to the next room.)

Flying, lifelink Whenever this creature or another nontoken creature you control enters, venture into the dungeon. (Enter the first room or advance to the next room.) {W}, Discard this card: Venture into the dungeon and you gain 3 life.

Deathtouch When Rilsa Rael enters, you take the initiative. Whenever you attack, target attacking creature gains deathtouch until end of turn. If you've completed a dungeon, that creature also gets +5/+0 and gains first strike and menace until end of turn.

Deathtouch During your turn, this creature has first strike. Whenever this creature attacks, venture into the dungeon. (Enter the first room or advance to the next room.)

When Monstrosity of the Lake enters, you may pay {5}. If you do, tap all creatures your opponents control, then put a stun counter on each of those creatures. (If a permanent with a stun counter would become untapped, remove one from it instead.) Islandcycling {2} ({2}, Discard this card: Search your library for an Island card, reveal it, put it into your hand, then shuffle.)

This land enters tapped. {T}: Add {W}, {U}, or {B}.

If you control two or more other lands, this land enters tapped. {T}: Add {W}. {4}{W}: This land becomes a 3/4 white Dragon creature with flying until end of turn. It's still a land.

As this land enters, you may reveal an Island or Swamp card from your hand. If you don't, this land enters tapped. {T}: Add {U} or {B}.

{T}: Add one mana of any color in your commander's color identity.

{T}: Add {C}. {T}, Sacrifice this land: Search your library for a basic Plains, Island, or Swamp card, put it onto the battlefield tapped, then shuffle. Cycling {W}{U}{B} ({W}{U}{B}, Discard this card: Draw a card.)

This land enters tapped unless you control an Island or a Swamp. {T}: Add {U} or {B}.

This land enters tapped. {T}: Add {C}. {4}, {T}, Tap an untapped legendary creature you control: Venture into the dungeon. Activate only as a sorcery. (Enter the first room or advance to the next room.)

{T}, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

{T}: Add one mana of any color that a land an opponent controls could produce.

{T}: Add {C}. {2}, {T}: Each player draws a card, then discards a card.

{T}: Add {U}. {T}: Add {B}. Activate only if you control an Island or a Swamp.

If you control two or more other lands, this land enters tapped. {T}: Add {U}. {5}{U}: Until end of turn, this land becomes a 7/7 blue Giant creature with ward {3}. It's still a land. (Whenever it becomes the target of a spell or ability an opponent controls, counter it unless that player pays {3}.)

{T}: Add {C}. {T}, Sacrifice a creature: You gain 1 life.

If you control two or more other lands, this land enters tapped. {T}: Add {B}. {3}{B}: Until end of turn, this land becomes a 3/3 black Beholder creature with menace and "Whenever this creature attacks, exile target card from defending player's graveyard." It's still a land.

({T}: Add {U}.)

{T}: Add {C}. {T}: Add {W}. Activate only if you control an Island. {T}: Add {U}. Activate only if you control a Plains.

({T}: Add {W}.)

As this land enters, you may reveal a Plains or Island card from your hand. If you don't, this land enters tapped. {T}: Add {W} or {U}.

({T}: Add {W} or {U}.) This land enters tapped unless you control two or more basic lands.

({T}: Add {W}, {U}, or {B}.) This land enters tapped. Cycling {3} ({3}, Discard this card: Draw a card.)

({T}: Add {W} or {B}.) This land enters tapped. When this land enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

This land enters tapped unless you control two or more other lands. {T}: Add {U} or {B}.

({T}: Add {U} or {B}.) This land enters tapped unless you control two or more basic lands.

({T}: Add {B}.)

Haste This creature attacks each combat if able. {1}{B}, Exile this card from your graveyard: Put an indestructible counter on target creature. Activate only as a sorcery.

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.

When this creature enters, you take the initiative. Whenever you attack, target attacking Cleric, Rogue, Warrior, or Wizard gains protection from creatures until end of turn. It explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on the creature, then put the card back or put it into your graveyard.)

{T}: Add one mana of any color in your commander's color identity.

Lands you control have "{T}: Add one mana of any color." {T}: Add one mana of any color.

{T}, Remove a component counter from this artifact: Add two mana of different colors. {T}: Roll a d20. 1—9 | Put a component counter on this artifact. 10—20 | Put two component counters on this artifact.

{T}: Add {C}. {3}, {T}: Venture into the dungeon. Activate only as a sorcery. (Enter the first room or advance to the next room.)

You may cast spells from your hand without paying their mana costs.

Menace At the beginning of your end step, if you have the initiative, create a Treasure token. Create three of those tokens instead if you've completed a dungeon. Choose a Background (You can have a Background as a second commander.)

When this artifact enters, you take the initiative. {T}: Add {C}. If you have the initiative, add {C}{C} instead. {3}, {T}: Exile cards from the top of your library until you exile a nonland card. You may cast that card without paying its mana cost. Activate only if you've completed a dungeon.

{B}, {T}, Sacrifice this creature: Return target creature card from your graveyard to the battlefield.

Return up to one target creature card from your graveyard to your hand. Venture into the dungeon. (Enter the first room or advance to the next room.)

Flying, protection from black Echo {3}{W}{W} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) When this creature enters, return target creature card from your graveyard to the battlefield.

{T}, Pay 3 life, Sacrifice this creature: Return target creature card from your graveyard to the battlefield. Activate only as a sorcery. Unearth {3}{W}{B} ({3}{W}{B}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Return target artifact or creature card with mana value 3 or less from your graveyard to the battlefield. If a creature enters this way, it enters with an additional +1/+1 counter on it.

Vigilance Whenever this creature enters or attacks, you may return target permanent card with mana value 3 or less from your graveyard to the battlefield.

{B}, Discard a creature card: Return target creature card from your graveyard to your hand.

Counter target noncreature spell. Its controller creates two Treasure tokens. (They're artifacts with "{T}, Sacrifice this token: Add one mana of any color.")

Flying When this creature enters or dies, exile target permanent.

Dakkon enters with a number of loyalty counters on him equal to the number of lands you control. +1: Surveil 2. −3: Exile target creature. −6: You may put an artifact card from your hand or graveyard onto the battlefield.

Exile target permanent with mana value 4 or greater.

You may sacrifice a nontoken blue creature rather than pay this spell's mana cost. Counter target spell.

Destroy target creature, enchantment, or planeswalker. Its controller creates two Map tokens. (They're artifacts with "{1}, {T}, Sacrifice this token: Target creature you control explores. Activate only as a sorcery.")

Flying {U}, Sacrifice this creature: Counter target noncreature spell. Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) When this creature enters, destroy target nonartifact, nonblack creature. Evoke {1}{B} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

This spell can't be countered. Destroy all creatures.

Exile target creature. Its controller gains life equal to its power.

Search your library for up to three creature cards, put them into your graveyard, then shuffle.

Crash Landing — Search your library for a basic land card, reveal it, put it into your hand, then shuffle. Goblin Camp — Create a Treasure token. Emerald Grove — Create a 2/2 white Knight creature token. Auntie's Teahouse — Scry 3. Defiled Temple — You may sacrifice a permanent. If you do, draw a card. Mountain Pass — You may put a land card from your hand onto the battlefield. Ebonlake Grotto — Create two 1/1 blue Faerie Dragon creature tokens with flying. Grymforge — For each opponent, goad up to one target creature that player controls. Githyanki Crèche — Distribute three +1/+1 counters among up to three target creatures you control. Last Light Inn — Draw two cards. Reithwin Tollhouse — Roll 2d4 and create that many Treasure tokens. Moonrise Towers — Instant and sorcery spells you cast this turn cost 3 less to cast. Gauntlet of Shar — Each opponent loses 5 life. Balthazar's Lab — Return up to two target creature cards from your graveyard to your hand. Circus of the Last Days — Create a token that's a copy of one of your commanders, except it's not legendary. Undercity Ruins — Create three 4/1 black Skeleton creature tokens with menace. Steel Watch Foundry — You get an emblem with "Creatures you control get +2/+2 and have trample." Ansur's Sanctum — Reveal the top four cards of your library and put them into your hand. Each opponent loses life equal to those cards' total mana value. Temple of Bhaal — Creatures your opponents control get -5/-5 until end of turn.

Yawning Portal — You gain 1 life. (Leads to: Dungeon Level) Dungeon Level — Scry 1. (Leads to: Goblin Bazaar, Twisted Caverns) Goblin Bazaar — Create a Treasure token. (Leads to: Lost Level) Twisted Caverns — Target creature can't attack until your next turn. (Leads to: Lost Level) Lost Level — Scry 2. (Leads to: Runestone Caverns, Muiral's Graveyard) Runestone Caverns — Exile the top two cards of your library. You may play them. (Leads to: Deep Mines) Muiral's Graveyard — Create two 1/1 black Skeleton creature tokens. (Leads to: Deep Mines) Deep Mines — Scry 3. (Leads to: Mad Wizard's Lair) Mad Wizard's Lair — Draw three cards and reveal them. You may cast one of them without paying its mana cost.

Cave Entrance — Scry 1. (Leads to: Goblin Lair, Mine Tunnels) Goblin Lair — Create a 1/1 red Goblin creature token. (Leads to: Storeroom, Dark Pool) Mine Tunnels — Create a Treasure token. (Leads to: Dark Pool, Fungi Cavern) Storeroom — Put a +1/+1 counter on target creature. (Leads to: Temple of Dumathoin) Dark Pool — Each opponent loses 1 life and you gain 1 life. (Leads to: Temple of Dumathoin) Fungi Cavern — Target creature gets -4/-0 until your next turn. (Leads to: Temple of Dumathoin) Temple of Dumathoin — Draw a card.

Trapped Entry — Each player loses 1 life. (Leads to: Veils of Fear, Oubliette) Veils of Fear — Each player loses 2 life unless they discard a card. (Leads to: Sandfall Cell) Sandfall Cell — Each player loses 2 life unless they sacrifice a creature, artifact, or land of their choice. (Leads to: Cradle of the Death God) Oubliette — Discard a card and sacrifice a creature, an artifact, and a land. (Leads to: Cradle of the Death God) Cradle of the Death God — Create The Atropal, a legendary 4/4 black God Horror creature token with deathtouch.