Omen of the Sea

Flash (You may cast this spell any time you could cast an instant.)
When Omen of the Sea enters, scry 2, then draw a card.
{2}{U}, Sacrifice Omen of the Sea: Scry 2. (Look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)

Night Brushwagg Ringmaster

{TK}{TK} — Menace
{TK}{TK}{TK} — Persist (When this permanent 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.)
{TK}{TK} — 2/3
{TK}{TK}{TK}{TK}{TK}{TK} — 10/10

Archaeomancer

When Archaeomancer enters, return target instant or sorcery card from your graveyard to your hand.

Lae'zel's Acrobatics

Exile all nontoken creatures you control, then roll a d20.
1—9 | Return those cards to the battlefield under their owner's control at the beginning of the next end step.
10—20 | Return those cards to the battlefield under their owner's control, then exile them again. Return those cards to the battlefield under their owner's control at the beginning of the next end step.

Soulherder

Whenever a creature is exiled from the battlefield, put a +1/+1 counter on Soulherder.
At the beginning of your end step, you may exile another target creature you control, then return that card to the battlefield under its owner's control.

Command Tower

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

Giant Mana Cake

{TK}{TK} — When this permanent leaves the battlefield, create two Food tokens. (They're artifacts with "{2}, {T}, Sacrifice this artifact: You gain 3 life.")
{TK}{TK}{TK}{TK} — When this permanent dies, destroy target nonland permanent.
{TK}{TK} — 3/3
{TK}{TK}{TK} — 6/2

Man-o'-War

When Man-o'-War enters, return target creature to its owner's hand.

Goblin Coward Parade

{TK}{TK} — Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)
{TK}{TK}{TK} — When this permanent leaves the battlefield, you may destroy target creature with power 4 or greater.
{TK}{TK} — 2/3
{TK}{TK}{TK}{TK} — 8/4

Plains

Island

Swift Response

Azure Fleet Admiral

When Azure Fleet Admiral enters, you become the monarch.
Azure Fleet Admiral can't be blocked by creatures the monarch controls.

Restoration Angel

Flash
Flying
When Restoration Angel enters, you may exile target non-Angel creature you control, then return that card to the battlefield under your control.

Mulldrifter

Flying
When Mulldrifter enters, draw two cards.
Evoke {2}{U} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

Scroll of Fate

{T}: Manifest a card from your hand. (Put that card onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Sol Ring

Karmic Guide

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 Karmic Guide enters, return target creature card from your graveyard to the battlefield.

Mystic Reflection

Choose target nonlegendary creature. The next time one or more creatures or planeswalkers enter this turn, they enter as copies of the chosen creature.
Foretell {U} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

Palace Sentinels

When Palace Sentinels enters, you become the monarch.

Essence Scatter

Skybridge Towers

Skybridge Towers enters tapped.
{T}: Add {W} or {U}.
{2}{W}{U}, {T}, Sacrifice Skybridge Towers: Draw a card.

Far Traveler

Commander creatures you own have "At the beginning of your end step, exile up to one target tapped creature you control, then return it to the battlefield under its owner's control."

Oblivion Ring

When Oblivion Ring enters, exile another target nonland permanent.
When Oblivion Ring leaves the battlefield, return the exiled card to the battlefield under its owner's control.

Priest of Ancient Lore

When Priest of Ancient Lore enters, you gain 1 life and draw a card.

Sea Gate Oracle

When Sea Gate Oracle enters, look at the top two cards of your library. Put one of them into your hand and the other on the bottom of your library.

Elemental Time Flamingo

{TK}{TK} — Exile this permanent: You may cast target nonland card from your graveyard this turn.
{TK}{TK}{TK}{TK} — Whenever a creature you control dies, each opponent loses 1 life and you gain 1 life.
{TK}{TK} — 1/5
{TK}{TK}{TK} — 5/4

Tome Raider

Flying
When Tome Raider enters, draw a card.

Fall from Favor

Enchant creature
When Fall from Favor enters, tap enchanted creature and you become the monarch.
Enchanted creature doesn't untap during its controller's untap step unless that player is the monarch.

Negate

Candlekeep Sage

Commander creatures you own have "When this creature enters or leaves the battlefield, draw a card."

Kor Cartographer

When Kor Cartographer enters, you may search your library for a Plains card, put it onto the battlefield tapped, then shuffle.

Cloudshift

Exile target creature you control, then return that card to the battlefield under your control.

Acrobatic Maneuver

Exile target creature you control, then return that card to the battlefield under its owner's control.
Draw a card.

Cloudform

When Cloudform enters, it becomes an Aura with enchant creature. Manifest the top card of your library and attach Cloudform to it. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)
Enchanted creature has flying and hexproof.

Goliath Paladin

Vigilance
When Goliath Paladin enters, you take the initiative.

Aarakocra Sneak

Flying
When Aarakocra Sneak enters, you take the initiative.

Valorous Stance

Choose one —
• Target creature gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)
• Destroy target creature with toughness 4 or greater.

Lightform

When Lightform enters, it becomes an Aura with enchant creature. Manifest the top card of your library and attach Lightform to it. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)
Enchanted creature has flying and lifelink.

Mistmeadow Witch

{2}{W}{U}: Exile target creature. Return that card to the battlefield under its owner's control at the beginning of the next end step.

Roving Harper

Squishy Sphinx Ninja

{TK}{TK} — Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)
{TK}{TK}{TK}{TK} — Provoke (Whenever this creature attacks, you may have target creature defending player controls untap and block it if able.)
{TK}{TK}{TK} — 5/3
{TK}{TK}{TK}{TK}{TK} — 7/7

Blur

Prison Realm

When Prison Realm enters, exile target creature or planeswalker an opponent controls until Prison Realm leaves the battlefield.
When Prison Realm enters, scry 1.

Thassa's Intervention

Choose one —
• Look at the top X cards of your library. Put up to two of them into your hand and the rest on the bottom of your library in a random order.
• Counter target spell unless its controller pays twice {X}.

Flickerwisp

Flying
When Flickerwisp enters, exile another target permanent. Return that card to the battlefield under its owner's control at the beginning of the next end step.

Park Bleater

Whenever another creature you own enters, you get {TK}.
{W}, {T}: You may put a sticker on a creature you own that entered this turn.

Galepowder Mage

Flying
Whenever Galepowder Mage attacks, exile another target creature. Return that card to the battlefield under its owner's control at the beginning of the next end step.

Geek Lotus Warrior

{TK}{TK} — {2}: This creature gets +2/+0 until end of turn.
{TK}{TK}{TK}{TK} — Whenever a creature enters under your control, this permanent deals 2 damage to target player.
{TK}{TK} — 4/1
{TK}{TK}{TK} — 3/6

Phyrexian Midway Bamboozle

{TK}{TK} — Whenever this creature attacks, you get {TK}.
{TK}{TK}{TK} — Undying (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.)
{TK}{TK} — 4/2
{TK}{TK}{TK}{TK}{TK} — 6/9

Abdel Adrian, Gorion's Ward

When Abdel Adrian, Gorion's Ward enters, exile any number of other nonland permanents you control until Abdel Adrian leaves the battlefield. Create a 1/1 white Soldier creature token for each permanent exiled this way.
Choose a Background (You can have a Background as a second commander.)

Brago, King Eternal

Flying
Whenever Brago, King Eternal deals combat damage to a player, exile any number of target nonland permanents you control, then return those cards to the battlefield under their owner's control.

Fiend Hunter

When Fiend Hunter enters, you may exile another target creature.
When Fiend Hunter leaves the battlefield, return the exiled card to the battlefield under its owner's control.

Prophetic Prism

When Prophetic Prism enters, draw a card.
{1}, {T}: Add one mana of any color.

Flicker of Fate

Exile target creature or enchantment, then return it to the battlefield under its owner's control.

Elspeth Conquers Death

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — Exile target permanent an opponent controls with mana value 3 or greater.
II — Noncreature spells your opponents cast cost {2} more to cast until your next turn.
III — Return target creature or planeswalker card from your graveyard to the battlefield. Put a +1/+1 counter or a loyalty counter on it.

Icewind Stalwart

Protection Fighting Style — When Icewind Stalwart enters, exile up to one target non-Warrior creature you control, then return it to the battlefield under its owner's control.

Settle Beyond Reality

Choose one or both —
• Exile target creature you don't control.
• Exile target creature you control, then return it to the battlefield under its owner's control.

Yawgmoth Merfolk Soul

{TK}{TK} — When this permanent leaves the battlefield, target player discards a card.
{TK}{TK}{TK}{TK}{TK} — When this permanent leaves the battlefield, create five 1/1 white Clown Robot artifact creature tokens.
{TK}{TK} — 3/3
{TK}{TK}{TK}{TK} — 6/5

Meandering River

Meandering River enters tapped.
{T}: Add {W} or {U}.

Glorious Protector

Flash
Flying
When Glorious Protector enters, you may exile any number of non-Angel creatures you control until Glorious Protector leaves the battlefield.
Foretell {2}{W}

Justiciar's Portal

Exile target creature you control, then return that card to the battlefield under its owner's control. It gains first strike until end of turn.

Planar Incision

Exile target artifact or creature, then return it to the battlefield under its owner's control with a +1/+1 counter on it.

Tranquil Cove

This land enters tapped.
When this land enters, you gain 1 life.
{T}: Add {W} or {U}.

Cloudblazer

Flying
When this creature enters, you gain 2 life and draw two cards.

Mage's Attendant

When Mage's Attendant enters, create a 1/1 blue Wizard creature token with "{1}, Sacrifice this creature: Counter target noncreature spell unless its controller pays {1}."

Touch the Spirit Realm

When Touch the Spirit Realm enters, exile up to one target artifact or creature until Touch the Spirit Realm leaves the battlefield.
Channel — {1}{W}, Discard Touch the Spirit Realm: Exile target artifact or creature. Return it to the battlefield under its owner's control at the beginning of the next end step.

Tomb of Horrors Adventurer

When Tomb of Horrors Adventurer enters, you take the initiative.
Whenever you cast your second spell each turn, copy it. If you've completed a dungeon, copy that spell twice instead. You may choose new targets for the copies. (A copy of a permanent spell becomes a token.)

Mana Leak

Counter target spell unless its controller pays {3}.

Vanish into Memory

Exile target creature. You draw cards equal to that creature's power. At the beginning of your next upkeep, return that card to the battlefield under its owner's control. If you do, discard cards equal to that creature's toughness.

Momentary Blink

Exile target creature you control, then return it to the battlefield under its owner's control.
Flashback {3}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Wispweaver Angel

Flying
When Wispweaver Angel enters, you may exile another target creature you control, then return that card to the battlefield under its owner's control.

Crib Swap

Changeling (This card is every creature type.)
Exile target creature. Its controller creates a 1/1 colorless Shapeshifter creature token with changeling.

Mnemonic Wall

Defender
When Mnemonic Wall enters, you may return target instant or sorcery card from your graveyard to your hand.

Cool Fluffy Loxodon

{TK}{TK} — When this permanent leaves the battlefield, draw a card.
{TK}{TK}{TK}{TK}{TK} — Whenever a creature enters under your control, this permanent becomes a 13/13 Eldrazi creature in addition to its other types until end of turn.
{TK}{TK} — 4/2
{TK}{TK}{TK}{TK} — 5/6

Elite Guardmage

Flying
When Elite Guardmage enters, you gain 3 life and draw a card.

Meteor Golem

When this creature enters, destroy target nonland permanent an opponent controls.

Eldrazi Guacamole Tightrope

{TK}{TK} — Haste
{TK}{TK}{TK}{TK}{TK} — You may cast this card from your graveyard by paying 2 life in addition to paying its other costs.
{TK}{TK} — 1/4
{TK}{TK}{TK} — 5/3

Repository Skaab

Exploit (When this creature enters, you may sacrifice a creature.)
When Repository Skaab exploits a creature, return target instant or sorcery card from your graveyard to your hand.

Rescue the Foal

Exile target creature you control, then return that card to the battlefield under its owner's control. (Then exile this card. You may cast the creature later from exile.)

Pegasus Guardian

Flying
At the beginning of your end step, if a permanent you controlled left the battlefield this turn, create a 1/1 white Pegasus creature token with flying.

Pegasus Guardian // Rescue the Foal

Deep-Fried Plague Myr

{TK}{TK} — Whenever this creature attacks, scry 1.
{TK}{TK}{TK} — Whenever this permanent leaves the battlefield, you may destroy target artifact or enchantment.
{TK}{TK}{TK} — 4/5
{TK}{TK}{TK}{TK} — 8/4

Misunderstood Trapeze Elf

{TK}{TK} — Whenever you cast a spell, this creature gets +X/+X until end of turn, where X is the amount of generic mana in that spell's mana cost.
{TK}{TK}{TK} — Hexproof
{TK}{TK} — 4/2
{TK}{TK}{TK}{TK} — 6/6

Sailor of Means

When Sailor of Means enters, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")