When Hopeful Vigil enters the battlefield, create a 2/2 white Knight creature token with vigilance.

When Hopeful Vigil is put into a graveyard from the battlefield, scry 2.

: Sacrifice Hopeful Vigil.

, Pay 1 life: Add or .

, , Sacrifice Horizon Canopy: Draw a card.

, , Sacrifice Horizon Spellbomb: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.

When Horizon Spellbomb is put into a graveyard from the battlefield, you may pay . If you do, draw a card.

Menace

When Horned Stoneseeker enters the battlefield, create a tapped Powerstone token. (It's an artifact with ": Add . This mana can't be spent to cast a nonartifact spell.")

When Horned Stoneseeker leaves the battlefield, sacrifice a Powerstone.

Sacrifice a Swamp: Regenerate target black creature. (The next time that creature would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat.)

When Hostile Investigator enters the battlefield, target opponent discards a card.

Whenever one or more players discard one or more cards, investigate. This ability triggers only once each turn. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

When Hotshot Investigators enters the battlefield, return up to one other target creature to its owner's hand. If you controlled it, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

Destroy target creature with power 4 or greater.

Investigate.(Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

At the beginning of your upkeep, you may remove a counter from a permanent you control. If you don't, sacrifice Hungry Hungry Heifer.

Echo (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 Hunting Moa enters the battlefield or dies, put a +1/+1 counter on target creature.

When Hurloon Shaman dies, each player sacrifices a land.

Flying

, Sacrifice Hydromorph Gull: Counter target spell that targets a creature you control.

, Discard a card: Prevent the next 3 damage that would be dealt to any target this turn.

, Sacrifice Hypochondria: Prevent the next 3 damage that would be dealt to any target this turn.

Icatian Moneychanger enters the battlefield with three credit counters on it.

When Icatian Moneychanger enters the battlefield, it deals 3 damage to you.

At the beginning of your upkeep, put a credit counter on Icatian Moneychanger.

Sacrifice Icatian Moneychanger: You gain 1 life for each credit counter on Icatian Moneychanger. Activate only during your upkeep.

As an additional cost to cast this spell, sacrifice a creature.

All creatures get -X/-X until end of turn, where X is the sacrificed creature's power.

Each +1/+1 counter on a creature you control is also a Food token. (It's an artifact with ", , Sacrifice this artifact: You gain 3 life.")

, : Roll two six-sided dice. For each odd result, put a +1/+1 counter on a creature of your choice. Activate only as a sorcery.

, : 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.

At the beginning of your upkeep, Ill-Gotten Inheritance deals 1 damage to each opponent and you gain 1 life.

, Sacrifice Ill-Gotten Inheritance: It deals 4 damage to target opponent and you gain 4 life.

Enchant creature

Enchanted creature has flying.

, Sacrifice Illuminated Wings: Draw a card.

Enchant creature

Enchanted creature gets +4/+4.

When enchanted creature becomes the target of a spell or ability, sacrifice Illusionary Armor.

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.)

At the beginning of your upkeep, choose a land type. Illusionary Presence gains landwalk of the chosen type until end of turn. (It can't be blocked as long as defending player controls a land of that type.)

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.)

As Illusionary Terrain enters the battlefield, choose two basic land types.

Basic lands of the first chosen type are the second chosen type.

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 the battlefield, you gain 20 life.

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

When you speak in non-rhyming sentences, sacrifice I'm Rubber, You're Glue.

Say "I'm rubber, you're glue. Everything bounces off me and sticks to you": Change the target of target spell or ability that targets only you.

Immersturm Skullcairn enters the battlefield tapped.

: Add .

, , Sacrifice Immersturm Skullcairn: It deals 3 damage to target player. That player discards a card. Activate only as a sorcery.

At the beginning of your upkeep, if there are seven or more lands on the battlefield, sacrifice Impending Disaster and destroy all lands.

, 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.

, Sacrifice Implement of Ferocity: Put a +1/+1 counter on target creature. Activate only as a sorcery.

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

, Sacrifice Implement of Malice: Target player discards a card. Activate only as a sorcery.

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

: Reveal the top card of your library. If it isn't a creature card, put it into your graveyard. Otherwise, put that card onto the battlefield. That creature gains haste. Sacrifice it at the beginning of the next end step.

Improvised Weaponry deals 2 damage to any target. Create a Treasure token. (It's an artifact with ", Sacrifice this artifact: Add one mana of any color.")

Affinity for artifacts (This spell costs less to cast for each artifact you control.)

When Imskir Iron-Eater enters the battlefield, you draw X cards and you lose X life, where X is half the number of artifacts you control, rounded down.

, Sacrifice an artifact: Imskir deals damage equal to the sacrificed artifact's mana value to any target.

Kicker (You may pay an additional as you cast this spell.)

Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn. If this spell was kicked, sacrifice that creature at the beginning of the next end step.

Other Elemental creatures you control get +1/+1.

, : You may put an Elemental creature card from your hand onto the battlefield. That creature gains haste until end of turn. Sacrifice it at the beginning of the next end step.

Choose two target creatures controlled by the same player. That player sacrifices one of them.

Bloodthirst X (This creature enters the battlefield with X +1/+1 counters on it, where X is the damage dealt to your opponents this turn.)

Menace

Enrage — Whenever Indoraptor, the Perfect Hybrid is dealt damage, choose an opponent at random. Indoraptor deals damage equal to its power to that player unless they sacrifice a nontoken creature.

Flying

At the beginning of your upkeep, draw a card unless target opponent sacrifices a creature or pays 3 life.

Enchant creature

Enchanted creature has "At the beginning of your upkeep, sacrifice a creature."

Cumulative upkeep—Pay and 1 life. (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.)

If a land is tapped for mana, it produces instead of any other type.

: Add .

, , Sacrifice Infernal Idol: You draw two cards and you lose 2 life.

As an additional cost to cast this spell, sacrifice a creature.

Add .

Enchant creature you control

Enchanted creature gets +2/+0.

, Sacrifice Inferno Fist: Inferno Fist deals 2 damage to any target.

When Ingot Chewer enters the battlefield, destroy target artifact.

Evoke (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters the battlefield.)

Cumulative upkeep—Pay 2 life. (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.)

Prevent all damage that would be dealt to creatures you control.

Each player sacrifices a creature.

At the beginning of your upkeep, any opponent may sacrifice a creature. If no one does, transform Innocent Traveler.

Vigilance

Unquestionable Wisdom — Other creatures you control get +1/+0 and have vigilance.

Hunt for Heresy — , : Tap target creature an opponent controls. Investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

, , Sacrifice Inscribed Tablet: Reveal the top five cards of your library. Put a land card from among them into your hand and the rest on the bottom of your library in a random order. If you didn't put a card into your hand this way, draw a card.

Exile the top three cards of your library. Until the end of your next turn, you may play those cards.

Create three Treasure tokens. (They're artifacts with ", Sacrifice this artifact: Add one mana of any color.")