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

This land enters tapped unless you have two or more opponents. {T}: Add {G} or {W}.

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

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

({T}: Add {G}.)

This land enters tapped. When this land enters, return a land you control to its owner's hand. {T}: Add {B}{G}.

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {W} or {U}.) 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.)

({T}: Add {R}.)

({T}: Add {W}.)

({T}: Add {B} or {R}.) 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 fewer other lands. {T}: Add {G} or {W}.

This land enters tapped. When this land enters, return a land you control to its owner's hand. {T}: Add {G}{W}.

({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.)

({T}: Add {R} or {G}.) This land enters tapped. Cycling {2} ({2}, Discard this card: Draw a card.)

({T}: Add {B}.)

This land enters tapped. When this land enters, scry 1. (Look at the top card of your library. You may put that card on the bottom.) {T}: Add {B} or {G}.

Whenever a creature you control deals combat damage to a player, you may draw a card. {1}{U}, {T}: Creatures your opponents control attack this turn if able.

You have no maximum hand size. {T}: Add {C}.

Destroy all artifacts you don't control, then exile the top X cards of your library, where X is the number of artifacts that were put into graveyards from the battlefield this turn. You may put a creature card exiled this way onto the battlefield. It gains haste. Return it to your hand at the beginning of the next end step.

Target creature you control deals damage equal to its power to another target creature. If excess damage was dealt this way, discover X, where X is that excess damage. (Exile cards from the top of your library until you exile a nonland card with that mana value or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)

You may play an additional land this turn. Draw a card.

Search your library for a Plains, Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle.

Until end of turn, each creature you control gets +2/+2 and gains trample and "This creature can't be blocked by more than one creature."

Create a token that's a copy of target creature you control, except the token has flying and it isn't legendary.

Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.

Search your library for a basic land card or Gate card, reveal it, put it into your hand, then shuffle.

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

You may play two additional lands on each of your turns.

You may play an additional land on each of your turns. Lands you control are every basic land type in addition to their other types.

Each other non-Human creature you control enters with an additional +1/+1 counter on it.

This spell costs {1} less to cast for each creature you control with a +1/+1 counter on it. Creature spells you cast cost {1} less to cast for each creature you control with a +1/+1 counter on it.

{T}: Add one mana of any color. If you control a creature with power 4 or greater, add two mana of any one color instead.

Whenever another creature you control enters, put a +1/+1 counter on that creature and a +1/+1 counter on this creature.

{T}: Add an amount of {G} equal to your devotion to green. (Each {G} in the mana costs of permanents you control counts toward your devotion to green.)

Whenever you attack, if it's the first combat phase of the turn, untap all attacking creatures. They gain first strike until end of turn. After this phase, there is an additional combat phase. Choose a Background (You can have a Background as a second commander.)

Landfall — Whenever a land you control enters, add one mana of any color.

Changeling (This card is every creature type.) {X}: Until end of turn, creatures you control have base power and toughness X/X and gain all creature types.

Trample When Old-Growth Troll dies, if it was a creature, return it to the battlefield. It's an Aura enchantment with enchant Forest you control and "Enchanted Forest has '{T}: Add {G}{G}' and '{1}, {T}, Sacrifice this land: Create a tapped 4/4 green Troll Warrior creature token with trample.'"

When Rishkar enters, put a +1/+1 counter on each of up to two target creatures. Each creature you control with a counter on it has "{T}: Add {G}."

Untap all permanents you control during each other player's untap step.

Ward {2} Whenever Sovereign Okinec Ahau attacks, for each creature you control with power greater than that creature's base power, put a number of +1/+1 counters on that creature equal to the difference.

As long as Archelos is tapped, other permanents enter tapped. As long as Archelos is untapped, other permanents enter untapped.

At the beginning of your upkeep, look at the top card of your library. If it's a creature or planeswalker card, you may reveal it and put it into your hand. If you don't put the card into your hand, you may put it on the bottom of your library.

Dethrone (Whenever this creature attacks the player with the most life or tied for most life, put a +1/+1 counter on it.) Other creatures you control have dethrone. Whenever a creature you control with a +1/+1 counter on it dies, return that card to the battlefield under your control at the beginning of the next end step.

Whenever you attack, double target creature's power until end of turn.

Whenever you cast your first spell during each of your turns, exile the top card of target opponent's library and create a Treasure token. Then you may cast the exiled card without paying its mana cost if it's a spell with mana value less than the number of artifacts you control. If you don't cast it this way, you may cast it this turn.

This spell can't be countered. Destroy target nonland permanent.

Whenever a creature you control with a +1/+1 counter on it deals combat damage to a player, you may draw a card.

Creatures you control have haste. Sacrifice this enchantment: Target creature gets +2/+2 until end of turn.

Commander creatures you own have "This creature enters with an additional +1/+1 counter on it" and "Other creatures you control enter with an additional +1/+1 counter on them."

Creature spells you control can't be countered. Nontoken creatures you control have riot. (They enter with your choice of a +1/+1 counter or haste.)

When this enchantment enters, draw a card, then you may put a land card from your hand onto the battlefield. If you put a Cave onto the battlefield this way, you gain 4 life. Lands you control enter untapped.

Trample Domain — Whenever this creature deals combat damage to a player, put X +1/+1 counters on target creature you control, where X is the number of basic land types among lands you control.

When this creature enters, you get {E}{E}{E} (three energy counters). Pay {E}{E}{E}: Put a +1/+1 counter on this creature. It gains hexproof until end of turn.

Grakmaw enters with three +1/+1 counters on it. Whenever another creature you control dies, if it had a +1/+1 counter on it, put a +1/+1 counter on Grakmaw. When Grakmaw dies, create an X/X black and green Hydra creature token, where X is the number of +1/+1 counters on Grakmaw.

This creature enters with X +1/+1 counters on it. When this creature dies, create a 1/1 green Snake creature token for each +1/+1 counter on it. Morph {3}{G}{G} As this creature is turned face up, put five +1/+1 counters on it.

{X}{X}{G}: Monstrosity X. (If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.) When this creature becomes monstrous, create X X/X green Hydra creature tokens.

If a creature would deal combat damage to this creature, prevent that damage and put a +1/+1 counter on this creature.

Trample Whenever a player casts a spell, put a +1/+1 counter on this creature.

Tribute 6 (As this creature enters, an opponent of your choice may put six +1/+1 counters on it.) When this creature enters, if tribute wasn't paid, you may have this creature fight another target creature. (Each deals damage equal to its power to the other.)

Trample Landfall — Whenever a land you control enters, put a +1/+1 counter on this creature. If that land is a Forest, put two +1/+1 counters on this creature instead.

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.) If damage would be dealt to this creature, prevent that damage. Put a -1/-1 counter on this creature for each 1 damage prevented this way.

This creature enters with two +1/+1 counters on it. When this creature dies, search your library for up to X basic land cards, where X is this creature's power, put them onto the battlefield, then shuffle.

Flying The Goose Mother enters with X +1/+1 counters on it. When The Goose Mother enters, create half X Food tokens, rounded up. Whenever The Goose Mother attacks, you may sacrifice a Food. If you do, draw a card.

Whenever you cast a spell with mana value 5 or greater, draw a card.

Reach Ulvenwald Hydra's power and toughness are each equal to the number of lands you control. When this creature enters, you may search your library for a land card, put it onto the battlefield tapped, then shuffle.

This creature enters with X +1/+1 counters on it. Whenever one or more +1/+1 counters are put on another non-Hydra creature you control, put a +1/+1 counter on this creature.

Destroy target permanent an opponent controls. Its controller may search their library for a basic land card, put it onto the battlefield, then shuffle.

Draw three cards, then put two cards from your hand on top of your library in any order.

Put four +1/+1 counters on each creature you control. Cycling {4}{G}{G} ({4}{G}{G}, Discard this card: Draw a card.) When you cycle this card, you may put four +1/+1 counters on target creature.

Exile target permanent with mana value 4 or greater.

Destroy target permanent. Its controller creates a 3/3 green Elephant creature token.

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.")