, : 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.)

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.

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.)

Reach (This creature can block creatures with flying.)

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

At the beginning of each player's draw step, if Howling Mine is untapped, that player draws an additional card.

When Howling Wolf enters, 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.)

Howlpack Wolf can't block unless you control another Wolf or Werewolf.

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

+2: Put two +1/+1 counters on up to one target Dinosaur you control.

−3: Target Dinosaur you control deals damage equal to its power to target creature you don't control.

−7: Dinosaurs you control get +4/+4 until end of turn.

+1: Put a loyalty counter on Huatli, Radiant Champion for each creature you control.

−1: Target creature gets +X/+X until end of turn, where X is the number of creatures you control.

−8: You get an emblem with "Whenever a creature you control enters, you may draw a card."

Vigilance

When Huatli's Raptor enters, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Hulking Cyclops can't block.

You may have Hulking Metamorph enter as a copy of an artifact or creature you control, except it's an artifact creature in addition to its other types, and its power and toughness are equal to Hulking Metamorph's power and toughness.

//PRT-Prototype_Mech//

Prototype (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)

3/3

Ward

At the beginning of your first main phase, add .

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

: Draw two cards. Target opponent gains control of Humble Defector. Activate only during your turn.

Hexproof (This creature can't be the target of spells or abilities your opponents control.)

Vigilance

: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)

As long as Hundred-Handed One is monstrous, it has reach and can block an additional ninety-nine creatures each combat.

Target creature gets +1/+0 and gains first strike until end of turn.

Splice onto Arcane—Tap an untapped white creature you control. (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)

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

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

Create a 3/1 black and red Vampire creature token with trample, lifelink, and haste. Sacrifice it at the beginning of the next end step.

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

As long as you control another Wolf or Werewolf, Hungry Ridgewolf gets +1/+0 and has trample.

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.)

Flying, haste

When Hunted Dragon enters, target opponent creates three 2/2 white Knight creature tokens with first strike.

Trample

When Hunted Horror enters, target opponent creates two 3/3 green Centaur creature tokens with protection from black.

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.

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

Threshold — As long as seven or more cards are in your graveyard, Hunting Grounds has "Whenever an opponent casts a spell, you may put a creature card from your hand onto the battlefield."

First strike

Dinosaur spells you cast have prowl . (You may cast a spell for its prowl cost if you dealt combat damage to a player this turn with a creature with any of its creature types.)

During turns other than yours, this spell costs more to cast.

Return all nonland permanents to their owners' hands. End the turn. (Exile all spells and abilities from the stack, including this card. The player whose turn it is discards down to their maximum hand size. Damage wears off, and "this turn" and "until end of turn" effects end.)

Exile target creature. Until the end of your next turn, you may cast that card and you may spend mana as though it were mana of any color to cast that spell.

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

Hurloon Battle Hymn deals 4 damage to target creature or planeswalker. If this spell was kicked, you gain 4 life.

When Hurloon Shaman dies, each player sacrifices a land of their choice.

: Add .

: Add . Activate only if you control a Forest or a Plains.

: Hyalopterous Lemure gets -1/-0 and gains flying until end of turn.

Whenever Hydra Omnivore deals combat damage to an opponent, it deals that much damage to each other opponent.

Enchant creature

When Hydra's Growth enters, put a +1/+1 counter on enchanted creature.

At the beginning of your upkeep, double the number of +1/+1 counters on enchanted creature.

As Hydroelectric Laboratory enters, you may pay 3 life. If you don't, it enters tapped.

: Add .

Target land becomes a 3/3 Elemental creature with flying until end of turn. It's still a land.

Attacking creatures get -2/-0 until end of turn.

Draw a card.

Flying

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

Whenever you tap an untapped creature an opponent controls, you may pay . When you do, choose one —

• Create a 4/4 white and blue Elemental creature token.

• Put a +1/+1 counter on each creature you control.

• Scry 2, then draw a card.