Whenever you cast a noncreature spell, put an oil counter on Ichor Synthesizer.

As long as Ichor Synthesizer has four or more oil counters on it, it gets +2/+0 and can't be blocked.

Deathtouch

Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)

Enchant creature

Enchanted creature loses all abilities and is a blue Fish with base power and toughness 0/1.

As Icon of Ancestry enters, choose a creature type.

Creatures you control of the chosen type get +1/+1.

, : Look at the top three cards of your library. You may reveal a creature card of the chosen type from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

When Icy Prison enters, exile target creature.

At the beginning of your upkeep, sacrifice Icy Prison unless any player pays .

When Icy Prison leaves the battlefield, return the exiled card to the battlefield under its owner's control.

Exile all cards from target player's hand and graveyard.

, : Create a 0/1 colorless Eldrazi Spawn creature token with "Sacrifice this creature: Add ."

Whenever another Eldrazi you control dies, put a +1/+1 counter on Idol of False Gods.

As long as Idol of False Gods has eight or more +1/+1 counters on it, it's a 0/0 creature in addition to its other types and it has annihilator 2.

: Add .

, Pay 1 life: Add .

, , Sacrifice a Desert: Put two -1/-1 counters on target creature an opponent controls. Activate only as a sorcery.

This spell costs less to cast if there is a land card in your graveyard.

When Igneous Elemental enters, you may have it deal 2 damage to target creature.

Igneous Inspiration deals 3 damage to any target.

Learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)

Ignite Disorder deals 3 damage divided as you choose among one, two, or three target white and/or blue creatures.

Whenever Ignoble Soldier becomes blocked, prevent all combat damage that would be dealt by it this turn.

Protection from white

Menace

Whenever a creature you control deals combat damage to a player, you gain life equal to that creature's toughness.

Partner (You can have two commanders if both have partner.)

Flash

When Illicit Masquerade enters, put an impostor counter on each creature you control.

Whenever a creature you control with an impostor counter on it dies, exile it. Return up to one other target creature card from your graveyard to the battlefield.

Ceremorphosis — When Illithid Harvester enters, turn any number of target tapped nontoken creatures face down. They're 2/2 Horror creatures.

Trample

: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)

Discard any number of cards, then draw that many cards. Then if there are seven or more cards in your graveyard, create a 3/2 red and white Spirit creature token.

Double strike

Whenever Illuminator Virtuoso becomes the target of a spell you control, it connives. (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on this creature.)

Mutate (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)

Flying, trample

Whenever this creature mutates, exile cards from the top of your library until you exile a nonland permanent card. Put that card onto the battlefield or into your hand.

You choose how each player votes this turn.

Draw a card.

Flying

Cumulative upkeep (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.)

: You may choose a creature card in your hand whose mana cost could be paid by some amount of, or all of, the mana you spent on . If you do, you may cast that card face down as a 2/2 creature spell without paying its mana cost. If the creature that spell becomes as it resolves has not been turned face up and would assign or deal damage, be dealt damage, or become tapped, instead it's turned face up and assigns or deals damage, is dealt damage, or becomes tapped. Activate only as a sorcery.

Flying

When Illusionary Servant becomes the target of a spell or ability, sacrifice it.

Defender, flying, first strike

Cumulative upkeep (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.)

Cast this spell only during the declare blockers step on an opponent's turn.

Remove all attacking creatures from combat and untap them. After this phase, there is an additional combat phase. Each of those creatures attacks that combat if able. They can't attack you or planeswalkers you control that combat.

Cumulative upkeep (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.)

When Illusions of Grandeur enters, you gain 20 life.

When Illusions of Grandeur leaves the battlefield, you lose 20 life.

Cast this spell only if you've cast another spell this turn.

Flying

Enchant creature

You control enchanted creature.

Whenever a creature an opponent controls enters, attach Illusory Gains to that creature.

, Exile Illustrious Historian from your graveyard: Create a tapped 3/2 red and white Spirit creature token.

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

Creatures target opponent controls attack this turn if able. During that player's next untap step, creatures they control don't untap.

Cycling (, Discard this card: Draw a card.)

: Put a +1/+1 counter on target creature for each Elf you control.

When Immersturm Raider enters, you may discard a card. If you do, draw a card.

: Immolating Souleater gets +1/+0 until end of turn. ( can be paid with either or 2 life.)

Return each creature card with mana value X from your graveyard to the battlefield.

Ward (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays .)

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.)

Impact Resonance deals X damage divided as you choose among any number of target creatures, where X is the greatest amount of damage dealt by a source to a permanent or player this turn.

Flying

Whenever Impaler Shrike deals combat damage to a player, you may sacrifice it. If you do, draw three cards.

If CARDNAME is in your opening hand and you're not the starting player, you may reveal it. If you do, you become the starting player.

Haste

Flying

When Imperial Aerosaur enters, another target creature you control gets +1/+1 and gains flying until end of turn.

Enrage — Whenever Imperial Ceratops is dealt damage, you gain 2 life.

Search your library for a card, then shuffle and put that card on top. You lose 2 life.

Spend only mana produced by basic lands to cast this spell.

Vigilance

Afterlife 1 (When this creature dies, create a 1/1 white and black Spirit creature token with flying.)

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)

Indestructible

Partner with Proud Mentor (When this creature enters, target player may put Proud Mentor into their hand from their library, then shuffle.)

Whenever Impetuous Protege attacks, it gets +X/+0 until end of turn, where X is the greatest power among tapped creatures your opponents control.

, Sacrifice Implement of Combustion: It deals 1 damage to target player or planeswalker.

When Implement of Combustion is put into a graveyard from the battlefield, draw a card.

Each player may discard their hand and draw cards equal to the greatest mana value of a commander they own on the battlefield or in the command zone.

Vigilance

Cycling (, Discard this card: Draw a card.)