msem-instigator

Whenever a non-Spirit creature deals combat damage to a player, destroy that creature. Its controller creates a 1/1 colorless Spirit creature token.

Choose one or both —
• Prevent all combat damage that would be dealt to creatures this turn.
• Detain target creature. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)

Flash
When Axom enters, remove up to three counters from target permanent.
{2}{U}: Return Axom to its owner's hand.

Azun's Play deals damage to any target equal to the number of cards in your hand.
Quickdraw {R}{R} (When a creature you control blocks or becomes blocked, you may cast this spell for {R}{R}.)

Whenever an artifact or enchantment you control enters, you may detain target nonland permanent. (Until your next turn, that permanent can't attack or block and its activated abilities can't be activated.)

Whenever you detain a permanent, you gain life equal to that permanent's mana value.

Auras and Equipment you control have indestructible.
Whenever Bearidge Marshall attacks, you may create a white Aura enchantment token named Arrest attached to target creature. It has enchant creature and “Enchanted creature can't attack or block, and its activated abilities can't be activated.”

{2}, {T}: Tap target creature.

Equipped creature gets +1/+1.
Whenever equipped creature becomes blocked, you may pay {1}{W}. If you do, detain each creature blocking it. (Until your next turn, those creatures can't attack or block and its activated abilities can't be activated.)
Equip {2}

Vision (Whenever this or another creature you control enters, reveal the top card of your library. Then you may put that card into your graveyard.)
Whenever Blind Soulcaller envisions an instant or sorcery card, you may tap target permanent.

Bloodleaf Butcher gets +1/+0 and has deathtouch as long as five or more cards are in your graveyard.

{T}: Choose a color of a card in your graveyard. Add one mana of that color.

Deathtouch

{G}, {T}: Put a +1/+1 counter on Bloodleaf Tracker for each creature that entered this turn.

Target creature gets +1/+1 until end of turn for each card in your graveyard.

Discard a card: Bloodshot Berserker gets +1/-1 until end of turn. Any player may activate this ability.

Flash
This spell costs {2} less to cast if five or more cards are in your graveyard.

Flying, first strike

{B}, {T}: Post a bounty on target permanent. (Put a bounty counter on that permanent. It has “When this permanent is put into a graveyard from the battlefield, each opponent draws a card” as long as it has a bounty counter on it.)
{B}, {T}, Pay 2 life: Destroy target creature with a bounty counter on it.

Whenever a creature with a counter on it dies, create a Gold token. (It's an artifact with “Sacrifice this artifact: Add one mana of any color.”)

Haste
Whenever one or more creatures attack, you may discard a card. If you do, draw a card.

Reach
Hexproof (This creature can't be the target of spells or abilities your opponents control.)

Whenever a player activates an ability that isn't a mana ability, Burning-Tree Shaman deals 1 damage to that player.

Choose one or both —
• Put target detained creature on top of its owner's library.
• Detain target creature. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)