At the beginning of combat on your turn, each Merfolk creature you control explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on the exploring creature, then put the card back or put it into your graveyard.)

Whenever Hakbal of the Surging Soul attacks, you may put a land card from your hand onto the battlefield. If you don't, draw a card.

Haktos the Unscarred attacks each combat if able.

As Haktos enters, choose 2, 3, or 4 at random.

Haktos has protection from each mana value other than the chosen number.

Vigilance

Stunning Strike — , : Tap target creature.

Whenever Halimar Excavator or another Ally you control enters, target player mills X cards, where X is the number of Allies you control.

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.

Visit — Choose target creature you control. Each other creature you control becomes a copy of that creature until end of turn, except it isn't legendary.

Lights — 2, 6

If you control two or more other lands, Hall of Storm Giants enters tapped.

: Add .

: Until end of turn, Hall of Storm Giants becomes a 7/7 blue Giant creature with ward . It's still a land. (Whenever it becomes the target of a spell or ability an opponent controls, counter it unless that player pays .)

Hall of the Bandit Lord enters tapped.

, Pay 3 life: Add . If that mana is spent on a creature spell, it gains haste.

Prevent all damage target spell would deal this turn. You gain life equal to the damage prevented this way.

(: Add or .)

As Hallowed Fountain enters, you may pay 2 life. If you don't, it enters tapped.

As long as you control seven or more enchantments, creatures you control have flying and vigilance.

Whenever you cast an enchantment spell, create a white Spirit Cleric creature token with "This creature's power and toughness are each equal to the number of Spirits you control."

Until end of turn, if a creature would enter and it wasn't cast, exile it instead.

Draw a card.

Exile target nonlegendary creature, then return it to the battlefield under its owner's control. If it entered under your control, put a +1/+1 counter on it. Otherwise, tap it.

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

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.)

Creatures that attacked during their controller's last turn can't attack.

, , Untap a tapped creature you control: Create a 1/1 green and white Citizen creature token.

, , Untap two tapped creatures you control: Draw a card.

, , Untap fifteen tapped creatures you control: You win the game.

Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)

When Halo Hunter enters, destroy target Angel.

When Halo-Charged Skaab enters, each player mills two cards. Then you may put an instant, sorcery, or battle card from your graveyard on top of your library. (To mill two cards, a player puts the top two cards of their library into their graveyard.)

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, you gain 3 life.

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)

Whenever Hammer of Nazahn or another Equipment you control enters, you may attach that Equipment to target creature you control.

Equipped creature gets +2/+0 and has indestructible.

Equip

Equipped creature gets +2/+0.

Whenever equipped creature deals combat damage to a player, you may destroy target Equipment that player controls.

Equip

Myriad (Whenever this creature attacks, for each opponent other than defending player, you may create a token copy that's tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.)

Whenever Hammers of Moradin attacks, for each opponent, tap up to one target creature that player controls.

Each other creature you control that's a Zombie or Mutant gets +X/+X, where X is the number of counters on Hancock, Ghoulish Mayor.

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.)

Destroy target nonblack creature.

First strike

, Tap three untapped white creatures you control: Destroy target creature.

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

Other creatures you control with infect get +1/+1.

Whenever you cast a creature spell with infect, target player gets a poison counter.

During combat, players can't cast instant spells or activate abilities that aren't mana abilities.

, : Create a 2/2 colorless Homunculus creature token. It must be represented by a unique hand and two fingers at all times, or it ceases to exist.

Flying

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

, Exile Hanged Executioner: Exile target creature.

All artifacts have shroud. (They can't be the targets of spells or abilities.)

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

(Melds with Hanweir Battlements.)

Whenever Hapatra, Vizier of Poisons deals combat damage to a player, you may put a -1/-1 counter on target creature.

Whenever you put one or more -1/-1 counters on a creature, create a 1/1 green Snake creature token with deathtouch.

Menace (This creature can't be blocked except by two or more creatures.)

When Harald, King of Skemfar enters, look at the top five cards of your library. You may reveal an Elf, Warrior, or Tyvar card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

At the beginning of your upkeep, put a -1/-1 counter on each creature.

Flying

: Harbinger of the Hunt deals 1 damage to each creature without flying.

: Harbinger of the Hunt deals 1 damage to each other creature with flying.

You may cast this card as though it had flash if you pay more to cast it. (You may cast it any time you could cast an instant.)

When this creature enters, you may return target tapped creature an opponent controls to its owner's hand.

Reach (This creature can block creatures with flying.)

Whenever Harbor Guardian attacks, defending player may draw a card.

Enchant creature

Enchanted creature gets +0/+2 and has ": Draw a card, then discard a card."

Enchant creature

Enchanted creature gets +3/+3.

Commander creatures you own have "Whenever this creature attacks a player, if no opponent has more life than that player, another target creature you control gets +X/+X until end of turn, where X is this creature's power."

Target opponent gains control of target permanent you 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.

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

Gain control of any number of target creatures until end of turn. Untap those creatures. They gain haste until end of turn.

Vigilance

Whenever Harnessed Snubhorn deals combat damage to a player, return target artifact or enchantment card from your graveyard to the battlefield.

Discard a card: Exile the top two cards of your library. You may play those cards this turn.

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