Flying Whenever Haerthach, the Wight King deals combat damage to a player, you may sacrifice another creature. When you do, create a 1/1 white Spirit creature token with flying. Return the sacrificed card to the battlefield tapped and under your control at the beginning of the next end step.
Hafiq the Wise has hexproof as long as you've cast a spell this turn. {U}, Discard a card with mana value X: Counter target spell with mana value X. {U}, Sacrifice another permanent with mana value X: Return target instant or sorcery card with mana value X from your graveyard to your hand.
Tribute 1 (As this creature enters, an opponent of your choice may put a +1/+1 counter on it.) When Haggard Jackal enters, if tribute wasn't paid, each opponent discards a card.
Foresight — Whenever you draw your second card each turn, Haggler's Hound gets +1/+1 and can't be blocked by creatures with power 2 or less until end of turn.
[+1]: Haide Bankbuster deals 2 damage divided as you choose among one or two targets. [+1]: Draw two cards unless any player has Haide Bankbuster deal 3 damage to them. [–9]: Until end of turn, gain control of all permanents target player controls and they gain haste. Untap those permanents.
When Hail to the Queen enters, each player sacrifices a creature. Whenever a nontoken creature you control dies, you may pay its mana cost. If you do, create a token that's a copy of it.
Heroic — Whenever you cast a spell that targets Halcyon Hoplite, Halcyon Hoplite gains flying until end of turn. When Halcyon Hoplite dies, if it was enchanted, create a 1/1 white Bird creature token with flying.
Whenever Halford enters or attacks, an opponent chooses one. When they choose one that has already been chosen, copy that ability. • That opponent loses 2 life and you gain 2 life. • That opponent sacrifices a permanent. • That opponent discards a card. If they can't, draw a card.
Puzzlebox (Begin the game with this and another card you own from outside the game in the command zone, locked. That card is face down until you unlock this.) {1}, Sacrifice two Clues: Unlock Hall of Lost Histories and put the revealed card into your hand.
Vigilance The first instant or sorcery spell you cast each turn has conspire. (As you cast that spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose a new target for the copy.)
At the beginning of your end step, you may discard a creature card. If you do, you draw a card and you lose 1 life. Whenever a creature you control attacks alone, you may cast a creature card from your graveyard. That creature enters tapped and attacking. If you do, sacrifice the creature you attacked with at end of combat.
Flying When Hallowed Perspective enters, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”) You may exert Hallowed Perspective as it attacks. When you do, until your next turn, you may cast spells as though they had flash. (An exerted creature won't untap during your next untap step.)