msem-instigator

First strike
Creatures you control attacking cause abilities of that creature to trigger as though it entered.

First strike
Engage (This creature must be blocked each combat if able.)

Spells you cast that target Risti Operative cost {1} less to cast.
Abilities you activate that target Risti Operative cost {1} less to activate.

When Rotting Sunseeker dies, return target creature card with power 2 or less from your graveyard to your hand.

Vigilance
When Roya Ritualist enters or whenever you cast a spell, if {G}{U} was spent to cast it, draw a card, then you may put a land card from your hand onto the battlefield tapped. Put a +1/+1 counter on Roya Ritualist.

Ward {2}
Foresight — Whenever you draw your second card each turn, Royal Falconer gains flying until end of turn.

Whenever you cast a cryptic spell, creatures you control get +1/+1 until end of turn. (Artifacts, enchantments, and modal spells are cryptic.)

When Russet Denmother enters, choose one —
• Destroy target enchantment.
• Create a 2/1 red and white Fox creature token.

When Sandbluff Barflies enters, you gain 2 life.

When Seikatsu Warleader enters, if it's not a token, create a token that's a copy of target creature token you control.

Whenever a land you control enters, you may tap target creature.

First strike

When Strayseeker Ranger enters, search your library for a creature card with mana value 2 or less, reveal it, put it into your hand, then shuffle.
Recite {W}{W} (You may cast this creature from your graveyard for its recite cost. If you do, exile it when it enters or if it would leave the battlefield.)

Flying, first strike
When Swiftclaw Griffin enters, return a creature you control to its owner's hand.

Flying
Other creatures you control with flying get +1/+0.

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)

Whenever Tide Crasher attacks, if you control another Merfolk, tap target creature defending player controls.

Double strike (This creature deals both first-strike and regular combat damage.)
If three or more creatures are attacking you, you may cast Timely Commander as though it had flash.

Flying
When Valiant Instructor enters, you return up to one target enchantment card from your graveyard to your hand.

Vigilance
Whenever Watchful Navigator crews a Vehicle, that Vehicle gets +1/+1 and gains vigilance until end of turn.

When Weary Adventurer enters, return a permanent you control to its owner's hand.

Vigilance

Flying
When Yielder of Ambition enters, target creature gets +2/+2 until end of turn.
Fleeting {W} (You may cast this spell for its fleeting cost. If you do, sacrifice it at the beginning of the next end step.)

When Zhedina Provisioner enters, creatures you control get +1/+1 until end of turn. You gain 2 life.

{1}{U}: Aeon's Hand Cutthroat can't be blocked this turn.