msem-instigator

Sacrifice a creature: Put a +1/+1 counter on Blightroot.
Sacrifice a land: Blightroot gains indestructible until end of turn.

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.

Bloodcrazed Acolyte enters with a +1/+1 counter on it for each player who lost life this turn.

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

Creatures you control that have been dealt damage this turn get +2/+0.
When Bloodspawn enters, it deals 1 damage to target creature you control.

When Blossom-Ash Trance enters, you gain 3 life.
At the beginning of each end step, if you gained 3 or more life this turn, draw a card.

When Blossom-Sower Witch enters, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)
Whenever you sacrifice a permanent, you gain 1 life.

{2}, Sacrifice Bottled Fate: Put the top card and bottom card of your library into your hand.

Haste
At the beginning of your end step, sacrifice Breach Runner unless you return another creature you control to its owner's hand.

Equipped creature has indestructible as long as it's your turn.
Whenever equipped creature attacks, it gets +X/+0 until end of turn, where X is its power.
Equip {6}

Whenever another creature enters, Brutish Champion fights that creature.

{T}, Sacrifice a creature: Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)
{T}, Sacrifice a Clue: Create a 3/3 green Elemental creature token.

Equipped creature gets +1/+2.
At the beginning of your end step, if Bygone Blade isn't attached to a creature, you get a glory counter. (You lose glory counters before life. A player with ten or more glory counters wins the game.)
Equip {2}

Whenever one or more cards are put into an opponent's graveyard from their hand or library, Cackling Tormentor deals 2 damage to any target.

At the beginning of each opponent's upkeep, if that player has no cards in their hand, Cage of Torment deals 2 damage to that player.

Gain control of target creature.

Sacrifice Caravan Merchant: Add {R}{R}.

Flying, haste
When Cataclysmic Skytyrant enters, sacrifice all other non-Dragon creatures you control. For each creature sacrificed this way, create a 3/3 red Dragon creature token with flying.

You gain 5 life. Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)
Flashback {2}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Lifelink (Damage dealt by this creature also causes you to gain that much life.)
{1}{B}: You gain 1 life.

First strike (This creature deals combat damage before creatures without first strike.)
Whenever Cauldish Warmonger attacks, create a 1/1 white Soldier creature token that's tapped and attacking.

Trample
Chained Ravager can't attack or block unless a player has lost life this turn.

Whenever you cast a spell during an opponent's turn, put a +1/+1 counter on Champion of the Fae.

Menace
Creatures you control with mana value 1 get +2/+0 and have menace.

Tap an untapped creature you control: Put a charge counter on Channel the Spirits.
Remove nine charge counters from Channel the Spirits and sacrifice it: Creatures you control get +3/+3 and gain trample until end of turn. Activate only as a sorcery.