msem-instigator

Whenever you cast an instant or sorcery spell, each opponent loses 1 life and you gain 1 life.

Flash
When Hexfang Ascetic enters, return target spell to its owner's hand.

When Hextwister Hare enters, if you control another Shaman or there's a Shaman card in your graveyard, each opponent discards a card.

Hibernation Den enters tapped.
{T}: Add {W}.
{W}, {T}: You gain 1 life. Activate only as a sorcery and only if you control a white creature.

{1}{G}, Discard Hibiscus Snapdragon: Create a Treasure token.
Scavenge {4}{G} ({4}{G}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

Scry 2, then create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)
Monument {2}{R} (You may cast this transformed from your graveyard for its monument cost. Exile it if it would leave the battlefield or not resolve.)

Hidden Prowess deals 2 damage to target creature. When that creature dies this turn, create a 1/1 red Elemental creature token.

Flash
When Hidden Sprout enters, put a +1/+1 counter on target creature.

Target creature gains flying and gets +1/+0 for each card in your hand until end of turn.
Fuse (You may cast one or both halves of this card from your hand.)

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever you cast a noncreature spell, you gain life equal to its mana value.

Prowess
Whenever High Rollers Croupier attacks, you may put a lore counter on a Saga you control.

Flying
When High Spirits enters, target creature gains flying until end of turn.

Flash
Whenever you cast another spell with flash or an instant, put a +1/+1 counter on High Street Shadow.

When Highbeam Hulk enters, you may discard a card. If you do, draw a card.
Cycling {2} ({2}, Discard this card: Draw a card.)

Whenever you draw a card, put a +1/+1 counter on Highborn Meditant.

({T}: Add {R}.)
As Highland Dunes enters, you may pay 1 life. If you don't, Highland Dunes enters tapped.

Whenever Highland Elk deals damage to a creature, return that creature to its owner's hand (if it's still on the battlefield.)

Concord — Highland Hermit gets +1/+1 and has hexproof as long as there are four or more card types among permanents you control.

({T}: Add {R} or {G}.)
Highland Vale enters tapped.

{T}: Add {G}.
Dominance — {T}: Add {G}{G}. Activate only if you control the creature with the greatest power or tied for the greatest power.

Flying
You may look at the top card of your library any time.

Flash
When Highpoint Guru enters, scry X, where X is the number of Monks you control.

Flying, lifelink

Flying
When Highspire Informant enters, scry 1.

Destroy target tapped creature.
Menagerie — If there are five or more creature types among creatures you control, that creature's controller discards a card.