Backup 1 (When this creature enters the battlefield, put a +1/+1 counter on target creature. If that's another creature, it gains the following abilities until end of turn.)

Flying

Whenever this creature attacks, return target nonland permanent card with mana value X or less from your graveyard to the battlefield, where X is this creature's power.

White creatures you control get +2/+2 until end of turn.

Deathtouch

When Guildsworn Prowler dies, if it wasn't blocking, draw a card.

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

Flying

Whenever Gwaihir attacks, target attacking creature gains flying until end of turn.

At the beginning of each end step, if you gained 3 or more life this turn, create a 3/3 white Bird creature token with flying and "Whenever this creature attacks, target attacking creature gains flying until end of turn."

Hagra Crocodile can't block.

Landfall — Whenever a land enters the battlefield under your control, Hagra Crocodile gets +2/+2 until end of turn.

When Halimar Tidecaller enters the battlefield, you may return target card with awaken from your graveyard to your hand.

Land creatures you control have flying.

Trample

Whenever you cast a spell, if that spell was kicked, put a +1/+1 counter on Hallar, the Firefletcher, then Hallar deals damage equal to the number of +1/+1 counters on it to each opponent.

Creatures you control that are enchanted or equipped have double strike.

At the beginning of each combat, you may attach target Aura or Equipment attached to a creature you control to target creature you control.

Bargain (You may sacrifice an artifact, enchantment, or token as you cast this spell.)

This spell costs less to cast if it's bargained.

Trample

When Hamlet Glutton enters the battlefield, you gain 3 life.

Whenever another creature enters the battlefield, you may put X +1/+1 counters on Hamletback Goliath, where X is that creature's power.

Sacrifice Hapless Researcher: Draw a card, then discard a card.

If one or more +1/+1 counters would be put on a creature you control, that many plus one +1/+1 counters are put on it instead.

Target creature you control gains vigilance and gets +X/+X until end of turn, where X is the number of creatures you control.

Target opponent gains control of target permanent you control.

Prevent all combat damage that would be dealt this turn.

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

Whenever Headless Rider or another nontoken Zombie you control dies, create a 2/2 black Zombie creature token.

Flying

Hellbent — Whenever Headless Specter deals combat damage to a player, if you have no cards in hand, that player discards a card at random.

When Healer of the Glade enters the battlefield, you gain 3 life.

Flying, lifelink

Equipped creature gets +0/+2 and has ": Prevent the next 1 damage that would be dealt to any target this turn."

: Attach Healer's Headdress to target creature you control.

Equip (: Attach to target creature you control. Equip only as a sorcery.)

This spell costs less to cast, where X is the number of cards in your graveyard that are instant cards, sorcery cards, and/or have an Adventure.

Exile all creatures. For each card exiled this way, you may play that card for as long as it remains exiled, and mana of any type can be spent to cast that spell. Exile Heartless Conscription.

Target opponent discards two cards.

Raid — If you attacked this turn, create a Treasure token. (It's an artifact with ", Sacrifice this artifact: Add one mana of any color.")

Whenever a player casts a noncreature spell, each of that player's opponents may draw a card.

Equipped creature doesn't untap during its controller's untap step.

Equipped creature has ": This creature deals 2 damage to any target."

Equip

Landfall — Whenever a land enters the battlefield under your control, Hedron Scrabbler gets +1/+1 until end of turn.

Target creature gets +1/+0 until end of turn. Put a first strike counter on it.

Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)

, Sacrifice Hellhole Flailer: Hellhole Flailer deals damage equal to its power to target player or planeswalker.

: Add .

, : Put a pressure counter on Hellion Crucible.

, , Remove two pressure counters from Hellion Crucible and sacrifice it: Create a 4/4 red Hellion creature token with haste. (It can attack and as soon as it comes under your control.)

: Hematite Golem gets +2/+0 until end of turn.

Flying

Cumulative upkeep—Gain control of a land you don't control. (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.)

Herald of Leshrac gets +1/+1 for each land you control but don't own.

When Herald of Leshrac leaves the battlefield, each player gains control of each land they own that you control.

Flying

, Exile Heron-Blessed Geist from your graveyard: Create two 1/1 white Spirit creature tokens with flying. Activate only if you control an enchantment and only as a sorcery.

Revolt — At the beginning of your end step, if a permanent you controlled left the battlefield this turn, create a 1/1 colorless Servo artifact creature token.

, Sacrifice a creature: Scry 1.

Each creature you control assigns combat damage equal to its toughness rather than its power.

Creatures you control can attack as though they didn't have defender.

: Untap target creature.

Whenever you cast a Spirit or Arcane spell, you may put a ki counter on Hired Muscle.

At the beginning of the end step, if there are two or more ki counters on Hired Muscle, you may flip it.

Trample

Whenever Hoard Hauler deals combat damage to a player, create a Treasure token for each artifact they control.

Crew 3

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

, Sacrifice another creature: Put a +1/+1 counter on Hobblefiend.

When Hollowhenge Wrangler enters the battlefield, seek a land card.

Discard a land card: Conjure a card named Hollowhenge Beast into your hand. You may also activate this ability while Hollowhenge Wrangler is in your graveyard.

Whenever equipped creature attacks, put a +1/+1 counter on that creature and each other creature you control that shares a creature type with it.

Equip

At the beginning of your upkeep, you gain 2 life for each Shrine you control.

The next time a source of your choice would deal damage to any target this turn, prevent that damage. If damage from a red source is prevented this way, Honorable Passage deals that much damage to the source's controller.

You may exert Hooded Brawler as it attacks. When you do, it gets +2/+2 until end of turn. (An exerted creature won't untap during your next untap step.)

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.

Flash

Ward

Horned Loch-Whale enters the battlefield tapped unless it's your turn.

Counter target creature spell. You create a Treasure token. (It's an artifact with ", Sacrifice this artifact: Add one mana of any color.")

: Add .

, Exile a land card from your graveyard: Hostile Desert becomes a 3/4 Elemental creature until end of turn. It's still a land.

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.")

Exile the top three cards of your library in a face-down pile, then exile the top three cards of your library in another face-down pile. Look at the cards in each pile, then turn a pile of your choice face up. An opponent chooses one of those piles. Put that pile into your hand and the other into your graveyard. You lose 3 life.

Up to one target creature has base power and toughness 1/1 until end of turn. Up to one other target creature has base power and toughness 4/4 until end of turn. Then Hostile Takeover deals 3 damage to each creature.