msem-instigator

Create three 1/1 white Soldier creature tokens. If you control an attacking creature, they're tapped and attacking. If you control a blocking creature, they're blocking target attacking creature.
Quickdraw {2}{W} (When a creature you control blocks or becomes blocked, you may cast this for {2}{W}.)

Whenever Rallying Guardian becomes untapped, creatures you control get +2/+0 until end of turn.

Flying
When Rallywing enters, creatures you control get +1/+1 until end of turn.

Razing Throng's power and toughness are each equal to the number of creatures you control.
Whenever one or more cards are put into exile from anywhere, create a 1/1 white Cleric creature token.
{2}{W}{W}: Exile a nonland card from a graveyard. You gain 3 life.

Flying
When Razorwing Champion enters, creatures you control get +1/+1 and gain vigilance until end of turn.

Creature tokens you control get +1/+1 and can block an additional creature each combat.

Draw a card for each creature you control with a permanent attached to it.

Create two 1/1 colorless Servo artifact creature tokens.
Leitmotif (If you cast this spell from your hand, exile it as it resolves. When you next cast a spell that shares a color with this card, you may cast this from exile without paying its mana cost.)

Flying

When Realmwalker Domovoi enters, exile another target permanent you control. Return it to the battlefield under your control at the beginning of the next end step.

Whenever a Plains you control enters, you may put a creature card with mana value 2 or less from your hand onto the battlefield.

Return target artifact or enchantment card from a graveyard to its owner's hand. You get a glory counter. (You lose glory counters before life. A player with ten or more glory counters wins the game.)

Flash
Creatures your opponents control have base power and toughness 1/1.
Fleeting {1}{W}{W} (You may cast this spell for its fleeting cost. If you do, sacrifice it at the beginning of the next end step.)

When Recollection Revelation enters, rouse 1. (Put a +1/+1 counter on a permanent you control. If it isn't a creature, tap it and it becomes a 0/0 creature in addition to its other types.)
{1}{W}, Sacrifice Recollection Revelation: Return another target artifact or enchantment card from your graveyard to your hand.

Return target artifact, enchantment, or planeswalker card with mana value 3 or less from your graveyard to the battlefield.

Choose one or both —
• Destroy target enchantment.
• Return target artifact card from your graveyard to your hand.

When Red-Crowned Admiral enters, create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)
Each creature you control with a +1/+1 counter on it has flying.

First strike
Whenever an opponent casts a noncreature spell, you gain 2 life.

Destroy all creatures. If a Reflection would be destroyed this way, its owner shuffles it into their library instead.

Destroy all monocolored creatures.

Slipstream (This creature can't be blocked as long as only creatures with slipstream are attacking.)
As long as you control three or more artifacts, Regal Seasnake has vigilance. (Attacking doesn't cause it to tap.)

Choose two —
• You gain 3 life.
• Tap target creature.
• Put a +1/+1 counter on target creature.

Flash
When Reinforced Platemail enters, you may attach it to target creature you control.
Equipped creature you control gets +1/+2.
Equip {3}

Harmony — Destroy target artifact or enchantment.
When Rejoicing Aristocrats enters, harmonize. (Trigger up to one harmony of one permanent you control.)