When Hostile Investigator enters, 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.

Haste

Hotheaded Giant enters 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.)

All creatures lose indestructible until end of turn. Hour of Devastation deals 5 damage to each creature and each non-Bolas planeswalker.

Strive — This spell costs more to cast for each target beyond the first.

Exile any number of target creatures. For each creature exiled this way, its controller creates a 4/4 blue Sphinx creature token with flying.

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.

: Add . Put a time counter on Hourglass of the Lost.

, Remove X time counters from Hourglass of the Lost and exile it: Return each nonland permanent card with mana value X from your graveyard to the battlefield. Activate only as a sorcery.

, : 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

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.

Target creature gets +X/+0 until end of turn.

Flash

Enchant creature

When Howl of the Hunt enters, if enchanted creature is a Wolf or Werewolf, untap that creature.

Enchanted creature gets +2/+2 and has 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.)

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.)

Whenever Howling Golem attacks or blocks, each player draws a card.

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, 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.

+2: You gain life equal to the greatest power among creatures you control.

0: Create a 3/3 green Dinosaur creature token with trample.

−X: Huatli, Warrior Poet deals X damage divided as you choose among any number of target creatures. Creatures dealt damage this way can't block this turn.

Assist (Another player can pay up to of this spell's cost.)

Two target players each draw a card.

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.")

Each artifact spell costs more to cast for each artifact its controller controls.

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.

Constellation — Whenever Humbler of Mortals or another enchantment you control enters, creatures you control gain trample until end of turn.

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.)

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

Morbid — Put three +1/+1 counters on that creature instead if a creature died this turn.

Hungering Hydra enters 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.)

Hungry Flames deals 3 damage to target creature and 2 damage to target player or planeswalker.

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

Create a 1/1 black and green Pest creature token with "When this creature dies, you gain 1 life."

Learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)

Put a +1/+1 counter on target creature you control. Then that creature fights target creature you don't control. (Each deals damage equal to its power to the other.)

Choose up to four target creatures you don't control. For each of them, that creature's controller faces a villainous choice — That creature becomes a 1/1 white Human creature and loses all abilities, or you create a token that's a copy of it.

Hunted Ghoul can't block Humans.

Flying

When Hunted Lammasu enters, target opponent creates a 4/4 black Horror creature token.

Hunted Phantasm can't be blocked.

When Hunted Phantasm enters, target opponent creates five 1/1 red Goblin creature tokens.

When Hunted Witness dies, create a 1/1 white Soldier creature token with lifelink.

When Hunter of Eyeblights enters, put a +1/+1 counter on target creature you don't control.

, : Destroy target creature with a counter on it.

Prevent all combat damage that would be dealt by nongreen creatures this turn.

When Hunter's Bow enters, attach it to target creature you control. That creature deals damage equal to its power to up to one target creature you don't control.

Equipped creature has reach and ward .

Equip

Any number of target players each gain 6 life.

This spell costs less to cast if it targets a blue permanent you don't control.

This spell can't be countered.

Target creature you control gets +1/+1 until end of turn. Then it deals damage equal to its power to target creature or planeswalker you don't control.