Inventor's Apprentice gets +1/+1 as long as you control an artifact.

At the beginning of your upkeep, if you control three or more artifacts, you gain 1 life.

: Add .

, , Sacrifice Inventors' Fair: Search your library for an artifact card, reveal it, put it into your hand, then shuffle. Activate only if you control three or more artifacts.

At the beginning of combat on your turn, switch the power and toughness of each of any number of target creatures until end of turn.

Investigator's Journal enters the battlefield with a number of suspect counters on it equal to the greatest number of creatures a player controls.

, , Remove a suspect counter from Investigator's Journal: Draw a card.

, Sacrifice Investigator's Journal: Draw a card.

Invigorating Hot Spring enters the battlefield with four +1/+1 counters on it.

Modified creatures you control have haste. (Equipment, Auras you control, and counters are modifications.)

Remove a +1/+1 counter from Invigorating Hot Spring: Put a +1/+1 counter on target creature you control. Activate only as a sorcery and only once each turn.

Enchant creature

Enchanted creature can't be blocked except by Walls.

Enchant creature

Enchanted creature has "Whenever this creature attacks, create a 4/4 white Angel creature token with flying that's tapped and attacking. Exile that token at end of combat."

Target opponent sacrifices a creature. If they can't, they lose 2 life and you draw a card. Then repeat this process for an enchantment and a planeswalker.

Create two 4/5 green Spirit creature tokens. For each of them, put your choice of a vigilance counter, a reach counter, or a trample counter on it.

, Remove a +1/+1 counter or a charge counter from a permanent you control: Ion Storm deals 2 damage to any target.

Enchant creature

Enchanted creature gets +2/+2, has vigilance, and can block an additional creature each combat.

: Untap another target permanent.

: Untap two other target legendary creatures.

Trample

Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.)

Paradox — Whenever you cast a spell from anywhere other than your hand, create a 2/2 red Alien Warrior creature token.

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

: Iridescent Blademaster gets +2/+2 until end of turn.

At the beginning of your end step, create a 1/1 green Insect creature token for each +1/+1 counter you've put on creatures under your control this turn.

Green enchantment spells and white enchantment spells cost more to cast.

Enchant creature you control

When Iroas's Blessing enters the battlefield, it deals 4 damage to target creature or planeswalker an opponent controls.

Enchanted creature gets +1/+1.

Haste

Fabricate 1 (When this creature enters the battlefield, put a +1/+1 counter on it or create a 1/1 colorless Servo artifact creature token.)

Whenever a player casts a red spell, you may pay . If you do, you gain 1 life.

When Ironclad Slayer enters the battlefield, you may return target Aura or Equipment card from your graveyard to your hand.

Enchant creature

Enchanted creature gets -0/-1.

Enchanted creature can't block creatures with power equal to or greater than the enchanted creature's toughness.

Whenever Iron-Craw Crusher attacks, target attacking creature gets +X/+0 until end of turn, where X is Iron-Craw Crusher's power.

//PRT-Prototype_Mech//

Prototype (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)

2/5

Reach

Whenever you cast your second spell each turn, Iron-Fist Pulverizer deals 2 damage to target opponent. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

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

Whenever Ironsoul Enforcer or a commander you control attacks alone, return target artifact card from your graveyard to the battlefield.

Exile target artifact or enchantment.

When Irreverent Revelers enters the battlefield, choose one —

• Destroy target artifact.

• Irreverent Revelers gains haste until end of turn.

This spell can't be countered.

Bushido 2 (Whenever this creature blocks or becomes blocked, it gets +2/+2 until end of turn.)

: Regenerate target Samurai.

Damage can't be prevented this turn. If a source you control would deal damage this turn to an opponent or a permanent an opponent controls, it deals triple that damage instead.

Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Whenever an opponent casts a Spirit or Arcane spell, Ishi-Ishi, Akki Crackshot deals 2 damage to that player.

Reach

Delirium — When Ishkanah, Grafwidow enters the battlefield, if there are four or more card types among cards in your graveyard, create three 1/2 green Spider creature tokens with reach.

: Target opponent loses 1 life for each Spider you control.

: Target creature with flying has base power 0 until end of turn.

Shroud (This creature can't be the target of spells or abilities.)

Isleback Spawn gets +4/+8 as long as a library has twenty or fewer cards in it.

Exile target permanent with mana value 1.

: Add .

, : Scry 1, then you may reveal the top card of your library. If a basic land card is revealed this way, put it onto the battlefield tapped. Activate only if an opponent controls at least two more lands than you.

Whenever an opponent casts a creature spell, that player loses 2 life unless they pay .

Flying

Whenever Isperia the Inscrutable deals combat damage to a player, choose a card name. That player reveals their hand. If a card with the chosen name is revealed this way, search your library for a creature card with flying, reveal it, put it into your hand, then shuffle.

Flying

When Isperia's Skywatch enters the battlefield, detain target creature an opponent controls. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)

You may look at the top card of your library any time.

You may play snow lands and cast snow spells from the top of your library.

Whenever another snow permanent enters the battlefield under your control, you may pay , , or . If you do, put a +1/+1 counter on Isu the Abominable.

Emerge (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value.)

When you cast this spell, create two 1/1 green Insect creature tokens.

When It That Gets Left Hanging enters the battlefield, ask a person outside the game to high-five you. If they won't, It That Gets Left Hanging gains haste until end of turn.

First strike, trample, lifelink

Flying

When Ithilien Kingfisher dies, draw a card.

Haste

When Itzquinth, Firstborn of Gishath enters the battlefield, you may pay . When you do, target Dinosaur you control deals damage equal to its power to another target creature.

Protection from red

Creatures named Ivory Guardians get +1/+1 as long as an opponent controls a nontoken red permanent.

Untap each creature you control with a +1/+1 counter on it during each other player's untap step.

Flying

Whenever a player casts a spell that targets only a single creature other than Ivy, Gleeful Spellthief, you may copy that spell. The copy targets Ivy. (A copy of an Aura spell becomes a token.)

When Ixalan's Binding enters the battlefield, exile target nonland permanent an opponent controls until Ixalan's Binding leaves the battlefield.

Your opponents can't cast spells with the same name as the exiled card.