msem-instigator

The next 2 damage that a source of your choice would deal to you and/or permanents you control this turn is dealt to any target instead.

Flying
Harrier's Falcon can't attack or block alone.

Creatures with defender you control can attack as though they didn't have defender.
Each creature you control assigns combat damage equal to its toughness rather than its power.

Enchant land
Whenever enchanted land is tapped for mana, its controller adds one mana of any color.

Whenever another creature you control enters, you may gain 1 life.
Whenever a creature enters under an opponent's control, you may have that player lose 1 life.

When Hashiro's Vanguard enters, each player sacrifices a nontoken creature.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever another noncreature source deals damage to a creature or player, you may have Hav'za, Itavan Warchief deal half that damage, rounded up, to any target.

You gain 5 life, then you may regenerate target creature. (The next time this would be destroyed this turn, it isn't. Instead tap it.)

Flying, vigilance, deathtouch, lifelink

Enchant creature
Enchanted creature has flying and can only block creatures with flying.

At the beginning of combat on your turn, you may attach any number of Equipment you control to target creature you control.

Flying, lifelink, haste
At the beginning of the end step, sacrifice Helix Entity.

You may cast Heralds of Shikai from your graveyard as long as a creature an opponent controls died this turn.

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.

Flying
When Highspire Informant enters, scry 1.

Whenever a creature you control dies, put a soul counter on Hill of Souls.
{T}: Add {C}.
{T}, Remove a soul counter from Hill of Souls: Add one mana of any color.

Equipped creature gets +2/+2.
Whenever equipped creature attacks, draw a card. Noncreature spells you cast this turn can be cast as though they had flash.
Equip {2}

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.

Reach
Art of war — At the beginning of your end step, if Hinode Ranger dealt damage to an opponent this turn, put a +1/+1 counter on it.

This spell costs {1} less to cast for each planeswalker you control.
[+2]: Create a 2/2 colorless Spirit creature token.
[–3]: Double the number of each kind of counter on another target permanent.
[–9]: You get an emblem with “The ‘legend rule' doesn't apply to creatures and planeswalkers you control.”

When Hisana-no-Oni enters, gain control of target creature until Hisana-no-Oni leaves the battlefield.

Creatures you control get +1/+4 until end of turn.

When Hollow Hooligan enters, up to two target creatures can't block this turn.
Mirage {1}{R} (You may cast this spell as though it had flash for its mirage cost. If you do, sacrifice it at the beginning of the next cleanup step.)

When Horizon Gazer enters, reveal the top two cards of your library. Put a noncreature card revealed this way into your hand and the rest into your graveyard.
Ascend {3}{G} ({3}{G}: Exile this creature, then return it to the battlefield transformed. Ascend only as a sorcery.)