msem-instigator

Whenever you cast a legendary spell or play a legendary land, put a +1/+1 counter on Henros, Royal Herald and you gain 1 life.
{2}{W}: Look at the top six cards of your library. You may exile a legendary card from among them. Then shuffle. If the exiled card has mana value less than Henros's power, you may put it onto the battlefield tapped. If you don't, put it into your hand.

When Herald of Darkness enters, destroy up to one target creature with mana value 3 or less.

Flying
{2}{W}, Sacrifice Herald of the Departed: Create two 1/1 white Spirit creature tokens with flying.

Haste
{1}{R}, {T}: Attacking creatures you control get +1/+0 until end of turn.

Rapport — Whenever Herald of the Hunt and at least one other creature you control become tapped, nourish 1. (To nourish 1, either put a +1/+1 counter on this creature or create a 1/1 white Citizen creature token.)

Encourage ({T}: Another target creature you control gets +1/+1 until end of turn. Encourage only as a sorcery.)
Whenever a creature deals combat damage to a player, if it was encouraged by Herald of the White Orchid this turn, create a 1/1 white Soldier creature token.

At the beginning of your upkeep, nourish 1. (To nourish 1, either put a +1/+1 counter on this creature or create a 1/1 white Citizen creature token.)

When Hermetic Fisher dies, you may return target creature to its owner's hand.

Whenever Hero of Aer attacks, it gets +2/+1 until end of turn.

Whenever Heroic Exemplar attacks, if its power is greater than its base power, other creatures you control get +1/+1 until end of turn.

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

As Hexplate Companion enters, choose a card name.
You and Hexplate Companion each have protection from the chosen card name.

At the beginning of your upkeep, put a +1/+1 counter on Heyu, Immortal Hunter.
Whenever Heyu becomes the target of a spell or ability an opponent controls, counter it if Heyu has the greatest power among creatures on the battlefield.

Encourage ({T}: Another target creature you control gets +1/+1 until end of turn. Encourage only as a sorcery.)
{T}: Add {G}.
Whenever Hierarch Ranger encourages a creature, add one mana of any color.

At the beginning of your upkeep, if you control a legendary creature, you draw a card and you lose 1 life.

Flash
Prowess
When High Rollers Esteemed enters, you may choose new targets for target spell or ability unless its controller has High Rollers Esteemed deal 4 damage to them.

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

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.

Flying
When Highspire Informant enters, scry 1.

When Hinasa Historian enters, create a 2/2 colorless Spirit creature token.
Whenever a colorless creature you control enters, you gain 1 life.

When Hinasa Lorekeeper enters, create a 2/2 colorless Spirit creature token.
Colorless creatures you control have vigilance.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When Hinasa Mystic enters, draw a card.

{2}{R}, {T}, Exert Hinterland Ritualist, Sacrifice another creature: Hinterland Ritualist deals damage equal to the sacrificed creature's power to any target. Activate only as a sorcery. (An exerted creature won't untap during your next untap step.)

When Hirukari's Immortal dies, if it didn't enter this turn, create a token that's a copy of it, except it has no mana cost.