Until end of turn, permanents your opponents control gain "When this permanent deals damage to the player who cast Hellish Rebuke, sacrifice this permanent. You lose 2 life."

Spells cost less to cast.

Adamant — If at least three mana of the same color was spent to cast this spell, Henge Walker enters the battlefield with a +1/+1 counter on it.

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for .)

Flying

At the beginning of your end step, each opponent discards a card.

, Sacrifice an artifact: Target creature gets -2/-2 until end of turn.

Devoid (This card has no color.)

Colorless spells you cast cost less to cast.

Flying

When Herald of the Forgotten enters the battlefield, if you cast it, return any number of target permanent cards with cycling abilities from your graveyard to the battlefield.

Bestow (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)

Flying

At the beginning of your upkeep, you lose 1 life.

Enchanted creature gets +3/+3 and has flying.

As Herald's Horn enters the battlefield, choose a creature type.

Creature spells you cast of the chosen type cost less to cast.

At the beginning of your upkeep, look at the top card of your library. If it's a creature card of the chosen type, you may reveal it and put it into your hand.

Flying, trample

Megamorph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)

When Herdchaser Dragon is turned face up, put a +1/+1 counter on each other Dragon creature you control.

Whenever an opponent casts a spell during your turn, draw a card.

At the beginning of each upkeep, if no spells were cast last turn, transform Hermit of the Natterknolls.

Heroic — Whenever you cast a spell that targets Hero of Leina Tower, you may pay . If you do, put X +1/+1 counters on Hero of Leina Tower.

Whenever you cast a spell that targets Hero of the Games, creatures you control get +1/+0 until end of turn.

Whenever you cast a spell that targets Hero of the Pride, creatures you control get +1/+0 until end of turn.

When Heroes of the Revel enters the battlefield, create a 1/1 red Satyr creature token with "This creature can't block."

Whenever you cast a spell that targets Heroes of the Revel, creatures you control get +1/+0 until end of turn.

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

Creatures you control get +2/+1 until end of turn. If this spell was kicked, those creatures also gain trample until end of turn.

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

When an opponent casts an enchantment spell, if Hidden Ancients is an enchantment, Hidden Ancients becomes a 5/5 Treefolk creature.

Hidden Courtyard enters the battlefield tapped.

: Add .

, , Sacrifice Hidden Courtyard: Discover 4. Activate only as a sorcery. (Exile cards from the top of your library until you exile a nonland card with mana value 4 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.)

When an opponent casts an instant spell, if Hidden Gibbons is an enchantment, Hidden Gibbons becomes a 4/4 Ape creature.

Hidden Necropolis enters the battlefield tapped.

: Add .

, , Sacrifice Hidden Necropolis: Discover 4. Activate only as a sorcery. (Exile cards from the top of your library until you exile a nonland card with mana value 4 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.)

When an opponent casts a creature spell with flying, if Hidden Spider is an enchantment, Hidden Spider becomes a 3/5 Spider creature with reach. (It can block creatures with flying.)

Hidden Volcano enters the battlefield tapped.

: Add .

, , Sacrifice Hidden Volcano: Discover 4. Activate only as a sorcery. (Exile cards from the top of your library until you exile a nonland card with mana value 4 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.)

Devoid (This card has no color.)

When you cast this spell, for each opponent, gain control of up to one target creature that player controls until end of turn. Untap those creatures. They gain trample, haste, and annihilator 1 until end of turn.

Trample, haste, annihilator 1 (Whenever this creature attacks, defending player sacrifices a permanent.)

Frenzied Metabolism — As an additional cost to cast this spell, you may remove any number of +1/+1 counters from among creatures you control. This spell costs less to cast for each counter removed this way.

Vigilance, reach, ward

Titanic — Hierophant Bio-Titan can't be blocked by creatures with power 2 or less.

Each player can't cast more than one spell each turn.

, Sacrifice High Noon: It deals 5 damage to any target.

You may discard a card or sacrifice a land. If you do, draw two cards.

Plot (You may pay and exile this card from your hand. Cast it as a sorcery on a later turn without paying its mana cost. Plot only as a sorcery.)

Flying, trample

Spells you cast cost less to cast for each target.

Spells your opponents cast cost more to cast for each target.

At the beginning of each upkeep, if no spells were cast last turn, transform Hinterland Hermit.

Hinterland Scourge must be blocked if able.

At the beginning of each upkeep, if a player cast two or more spells last turn, transform Hinterland Scourge.

When Hired Hexblade enters the battlefield, if mana from a Treasure was spent to cast it, you draw a card and you lose 1 life.

Discover 10. If the discovered card's mana value is less than 10, create a number of tapped Treasure tokens equal to the difference. (To discover 10, exile cards from the top of your library until you exile a nonland card with mana value 10 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.)

Flash (You may cast this spell any time you could cast an instant.)

Whenever a creature deals combat damage to you, if Hixus, Prison Warden entered the battlefield this turn, exile that creature until Hixus leaves the battlefield. (That creature returns under its owner's control.)

You can't spend mana to cast this spell.

Convoke, delve (Each creature you tap while casting this spell pays for or one mana of that creature's color. Each card you exile from your graveyard pays for .)

You may cast Hogaak, Arisen Necropolis from your graveyard.

Trample

This spell costs less to cast for each card you've cycled or discarded this turn.

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

Hexproof

Other permanents you control have hexproof.

At the beginning of combat on your turn, put two +1/+1 counters on each creature you control.

Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)

Put a +1/+1 counter on target creature you control. It gains vigilance until end of turn.

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

As an additional cost to cast this spell, discard a card.

Draw two cards. Amass Zombies 1. (Put a +1/+1 counter on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)

Delve (Each card you exile from your graveyard while casting this spell pays for .)

Trample

Devoid (This card has no color.)

Flash

When you cast this spell, counter target spell an opponent controls unless they pay .

Flying

Whenever Horde Ambusher blocks, it deals 1 damage to you.

Morph—Reveal a red card in your hand. (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

When Horde Ambusher is turned face up, target creature can't block this turn.

Whenever a player casts a spell, they may pay . If the player does, they draw a card at the beginning of the next end step.

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.

When Hostage Taker enters the battlefield, exile another target creature or artifact until Hostage Taker leaves the battlefield. You may cast that card for as long as it remains exiled, and mana of any type can be spent to cast that spell.

Trample

: Put a +1/+1 counter on target creature.

Daybound (If a player casts no spells during their own turn, it becomes night next turn.)

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.)

Destroy all nontoken creatures.

Whenever you cast a spell, you may have target player mill X cards, where X is the number of words in that spell's name.

Howling Gale deals 1 damage to each creature with flying and each player.

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

Each other creature you control that's a Werewolf or a Wolf gets +1/+1.

At the beginning of your end step, create a 2/2 green Wolf creature token.

At the beginning of each upkeep, if a player cast two or more spells last turn, transform Howlpack Alpha.

At the beginning of each upkeep, if a player cast two or more spells last turn, transform Howlpack of Estwald.

Flash (You may cast this spell any time you could cast an instant.)

Each creature you control that's a Wolf or a Werewolf gets +1/+1 and has trample.