You may cast Haakon, Stromgald Scourge from your graveyard, but not from anywhere else.

As long as Haakon is on the battlefield, you may cast Knight spells from your graveyard.

When Haakon dies, you lose 2 life.

Hagra Constrictor enters with two +1/+1 counters on it.

Each creature you control with a +1/+1 counter on it has menace. (A creature with menace can't be blocked except by two or more creatures.)

Vigilance

Stunning Strike — , : Tap target creature.

At the beginning of each player's upkeep, that player chooses a color. Until end of turn, lands tapped for mana produce mana of the chosen color instead of any other color.

If an opponent would create one or more tokens, they create half that many of each of those kinds of tokens instead, rounded down.

If an opponent would put one or more counters on a permanent or player, they put half that many of each of those kinds of counters on that permanent or player instead, rounded down.

Protection from black

Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)

Flying

When Hanged Executioner enters, create a 1/1 white Spirit creature token with flying.

, Exile Hanged Executioner: Exile target creature.

Whenever Hanweir Garrison attacks, create two 1/1 red Human creature tokens that are tapped and attacking.

(Melds with Hanweir Battlements.)

Target creature you control deals damage equal to its power to target creature or planeswalker you don't control.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

If an ability of a Shaman or another Wizard you control triggers, that ability triggers an additional time.

Flying

Non-Archon creatures have base power and toughness 3/3.

When Harmonious Archon enters, create two 1/1 white Human creature tokens.

Draw three cards.

, : Harpoon Sniper deals X damage to target attacking or blocking creature, where X is the number of Merfolk you control.

When Haru-Onna enters, draw a card.

Whenever you cast a Spirit or Arcane spell, you may return Haru-Onna to its owner's hand.

Search your library for up to X basic land cards, where X is the number of tapped creatures you control, put those cards onto the battlefield tapped, then shuffle.

Commander creatures you own have "Whenever this creature becomes tapped, it and other creatures you control that share a creature type with it each get +2/+0 and gain undying until end of turn." (When a creature with undying 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.)

Each player reveals the top card of their library. For each creature card revealed this way, create a token that's a copy of that card, except it's 1/1, it's a Spirit in addition to its other types, and it has flying. If no creature cards were revealed this way, return Haunting Imitation to its owner's hand.

Flying

When Havoc Demon dies, all creatures get -5/-5 until end of turn.

When Hazezon Tamar enters, create X 1/1 Sand Warrior creature tokens that are red, green, and white at the beginning of your next upkeep, where X is the number of lands you control at that time.

When Hazezon leaves the battlefield, exile all Sand Warriors.

Red creature spells you cast cost less to cast.

Whenever you cast a creature spell, you may discard a card. If you do, draw a card.

Exile target card from a graveyard.

Draw a card at the beginning of the next turn's upkeep.

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.

Activated abilities of creatures cost less to activate. This effect can't reduce the mana in that cost to less than one mana.

When Hedonist's Trove enters, exile target opponent's graveyard.

You may play lands from among cards exiled with Hedonist's Trove.

You may cast spells from among cards exiled with Hedonist's Trove. You can't cast more than one spell this way each turn.

: Add .

, , Sacrifice this artifact: Draw two cards.

Landfall — Whenever a land you control enters, target player mills three cards.

Whenever an artifact you control enters, Hedron Detonator deals 1 damage to target opponent.

, Sacrifice two artifacts: Exile the top card of your library. You may play that card this turn.

Landfall — Whenever a land you control enters, Hedron Rover gets +2/+2 until end of turn.

Level up (: Put a level counter on this. Level up only as a sorcery.)

LEVEL 1-4

1/4

If a source would deal damage to you or a creature you control, prevent 1 of that damage.

LEVEL 5+

2/5

If a source would deal damage to you or a creature you control, prevent 2 of that damage.

Choose one —

• Destroy X target artifacts and/or enchantments.

• Target player gains twice X life.

: Add .

, : You get (an energy counter).

, , Pay X , Sacrifice HELIOS One: Destroy target nonland permanent with mana value X. Activate only as a sorcery.

Flying

Whenever Hellcarver Demon deals combat damage to a player, sacrifice all other permanents you control and discard your hand. Exile the top six cards of your library. You may cast any number of spells from among cards exiled this way without paying their mana costs.

: 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.)

You may choose not to untap Helm of Possession during your untap step.

, , Sacrifice a creature: Gain control of target creature for as long as you control Helm of Possession and Helm of Possession remains tapped.

Domain — Create a 3/3 green Beast creature token for each basic land type among lands you control.

, Discard Herd Migration: Search your library for a basic land card, reveal it, put it into your hand, then shuffle. You gain 3 life.

Whenever you cast a multicolored spell, create a 1/1 white Human creature token.

Permanents you control gain hexproof and indestructible until end of turn.

Vigilance

Whenever another Human you control enters, put a +1/+1 counter on Heronblade Elite.

: Add X mana of any one color, where X is Heronblade Elite's power.

Flash

Lifelink

When Heron's Grace Champion enters, other Humans you control get +1/+1 and gain lifelink until end of turn.

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

Return all green permanents to their owners' hands.

Cumulative upkeep (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.)

Whenever you pay Hibernation's End's cumulative upkeep, you may search your library for a creature card with mana value equal to the number of age counters on Hibernation's End, put it onto the battlefield, then shuffle.

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

If target player has exactly 10 life, Hidetsugu's Second Rite deals 10 damage to that player.

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

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

Hipparion can't block creatures with power 3 or greater unless you pay .

Whenever Historian's Boon or another nontoken enchantment you control enters, create a 1/1 white Soldier creature token.

Whenever the final chapter ability of a Saga you control triggers, create a 4/4 white Angel creature token with flying and vigilance.

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 this turn, exile that creature until Hixus leaves the battlefield. (That creature returns under its owner's control.)

Flying

: Destroy target artifact. Hoard-Smelter Dragon gets +X/+0 until end of turn, where X is that artifact's mana value.

Enchant creature or planeswalker

When Hold for Questioning enters, tap enchanted permanent and investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

Enchanted permanent doesn't untap during its controller's untap step and its activated abilities can't be activated.