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.)

Hooded Hydra enters the battlefield with X +1/+1 counters on it.

When Hooded Hydra dies, create a 1/1 green Snake creature token for each +1/+1 counter on it.

Morph

As Hooded Hydra is turned face up, put five +1/+1 counters on it.

: Target green creature gets +1/+1 until end of turn.

As long as it's your turn, Hookblade Veteran has flying. (It can't be blocked except by creatures with flying or reach.)

Flying

If Hook-Haunt Drifter would be put into a graveyard from anywhere, exile it instead.

Flying

Sacrifice Hope of Ghirapur: Until your next turn, target player who was dealt combat damage by Hope of Ghirapur this turn can't cast noncreature spells.

Devoid (This card has no color.)

Flash

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

Flying

Training (Whenever this creature attacks with another creature with greater power, put a +1/+1 counter on this creature.)

, Remove two +1/+1 counters from among creatures you control: Destroy target artifact or enchantment.

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.

Vigilance, trample, haste

: You may play target Elemental card from your graveyard without paying its mana cost.

Flash

Flying, trample

Whenever you draw a card, you gain 1 life.

Flying

When Horizon Scholar enters the battlefield, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Boast — : Search your library for a basic land card, reveal it, put it into your hand, then shuffle. (Activate only if this creature attacked this turn and only once each turn.)

When Hornbash Mentor enters the battlefield, put a trample counter on target non-Human creature you control.

, : Put a +1/+1 counter on each creature you control with trample.

When Horned Kavu enters the battlefield, return a red or green creature you control to its owner's hand.

All Sliver creatures have trample.

: Regenerate Horned Troll.

Flying, haste

When Hornet Harasser dies, target creature gets -2/-2 until end of turn.

Flying, deathtouch

When Hornet Queen enters the battlefield, create four 1/1 green Insect creature tokens with flying and deathtouch.

Rampage 1 <I>(Whenever this creature becomes blocked, it gets +1/+1 until end of turn for each creature blocking it beyond the first.)</I>

Whenever you cycle or discard another card, Horror of the Broken Lands gets +2/+1 until end of turn.

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

: Untap Horseshoe Crab.

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.")

Haste

If a spell you control would deal damage to an opponent, prevent that damage. Create a 3/1 red Elemental Shaman creature token with haste for each 1 damage prevented this way.

When Hostility is put into a graveyard from anywhere, shuffle it into its owner's library.

Haste

Hotheaded Giant enters the battlefield with two -1/-1 counters on it unless you've cast another red spell this turn.

Hotshot Mechanic crews Vehicles as though its power were 2 greater.

Delirium — Hound of the Farbogs has menace as long as there are four or more card types among cards in your graveyard. (A creature with menace can't be blocked except by two or more creatures.)

, : Target creature doesn't untap during its controller's next untap step.

, : Surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

Flying

Hoverguard Observer can block only creatures with flying.

Flying, vigilance

Creatures with power less than Howlgeist's power can't block it.

Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

Creatures with power less than Howling Chorus's power can't block it.

Whenever Howling Chorus deals combat damage to a player, create a 3/2 colorless Eldrazi Horror creature token.

Reach (This creature can block creatures with flying.)

When Howling Giant enters the battlefield, create two 2/2 green Wolf creature tokens.

When Howling Wolf enters the battlefield, you may search your library for up to three cards named Howling Wolf, reveal them, put them into your hand, then shuffle.

Whenever a permanent you control is dealt damage, Howlpack Avenger deals that much damage to any target.

: Howlpack Avenger gets +2/+0 until end of turn.

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

This spell can't be countered.

, : You may put a creature card from your hand onto the battlefield. If it's a Wolf or Werewolf, untap Howlpack Piper. Activate only as a sorcery.

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

: Put target creature card from your graveyard on top of your library. Activate only during your turn, before attackers are declared.

When Huatli, Poet of Unity enters the battlefield, search your library for a basic land card, reveal it, put it into your hand, then shuffle.

: Exile Huatli, then return her to the battlefield transformed under her owner's control. Activate only as a sorcery.

Vigilance (Attacking doesn't cause this creature to tap.)

Hulking Cyclops can't block.

Hulking Goblin can't block.

Hulking Ogre can't block.

Flash

If an opponent would draw a card except the first one they draw in each of their draw steps, instead you create a Treasure token. (It's an artifact with ", Sacrifice this artifact: Add one mana of any color.")

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

: Add one mana of any color. Spend this mana only to cast a creature spell.

Flying

Whenever you attack with two or more creatures,

Augment (, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)

Rampage 1 <I>(Whenever this creature becomes blocked, it gets +1/+1 until end of turn for each creature blocking it beyond the first.)</I>

Flying

Soulshift 4 (When this creature dies, you may return target Spirit card with mana value 4 or less from your graveyard to your hand.)

Hungering Hydra enters the battlefield with X +1/+1 counters on it.

Hungering Hydra can't be blocked by more than one creature.

Whenever Hungering Hydra is dealt damage, put that many +1/+1 counters on it. (It must survive the damage to get the counters.)