msem-instigator

This spell costs {1} less to cast for each Scarecrow you control.
Other creatures you control get +0/+2 and have vigilance.

Destroy target nonland permanent with mana value less than or equal to the number of cards in your graveyard.

Target creature you control gets +2/+0 until end of turn. If that creature is attacking, you may aetherize it. (To aetherize, create a token that's a copy of it, then exile that token.)

Exile target creature. Search its controller's graveyard and library for any number of cards with the same name as that creature and exile them. Then that player shuffles.

When Ralezza's Disciple enters, if you control an enchantment, you gain 3 life.

When Esiara, Skycaster's Infiltrator enters, exile target spell with mana value 4 or less.
{1}{U}{U}, Discard two cards: Exile Esiara, then return it to the battlefield under your control.
{2}{U}{U}, {T}, Exile Esiara: Until end of turn, you may play cards you don't own from exile.

{W/B}: Kambiro, the Untrue King gets +1/+1 until end of turn.
Whenever a storied permanent you control enters, if you cast it, return target creature card from your graveyard to your hand. If that creature's power is less than Kambiro's power, you may return it to the battlefield instead. (Enchantments and legendary permanents are storied.)

Deathtouch
Inspired — Whenever Scar Tattooist becomes untapped, you may have target creature get -1/-1 until end of turn.

Encourage ({T}: Another target creature you control gets +1/+1 until end of turn. Encourage only as a sorcery.)
Whenever a creature deals combat damage to a player, if it was encouraged by Unbeholden Navigator this turn, draw a card.

Whenever you cast your second spell during each of your turns, you may activate one of Salome's loyalty abilities.
[+1]: Draw a card. Untap up to two lands.
[–4]: Destroy all creatures.
[–8]: You get an emblem with “You may pay {0} rather than pay the mana cost for the second spell you cast each turn.”

Lifelink
At the beginning of each player's end step, that player discards each card in their hand, then draws that many cards. When no cards are discarded this way, Dayang, Aspiring Muse deals 2 damage to each opponent.

Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
Whenever a +1/+1 counter is put on a creature you control, tap target creature you don't control.

Trample
Arpechian Champion can only attack or block alone.
Whenever a land you control enters, put a +1/+1 counter on Arpechian Champion.

Creatures your opponents control get -2/-0 until end of turn.
Draw a card.

Whenever Little Kibo attacks, you may pay {W}{W}. If you do, transform it.

Lifelink
Instant and sorcery spells you control have lifelink.
{2}{R}{W}: Copy target instant or sorcery spell. You may choose new targets for the copy.

Equipped creature has menace.
Equip {0} ({0}: Attach to target creature you control. Equip only as a sorcery.)

As long as Vinehorn Stag has a +1/+1 counter on it, it can't be blocked by more than one creature.

Choose one —
• Target creature gets +2/+0 and gains first strike until end of turn.
• Destroy target artifact.

Whenever you cast a spell that targets, Fume Whisperer gets +1/+1 until end of turn and can't be blocked this turn.

Gain control of target creature until end of turn. Untap that creature. It gains haste and is marked until end of turn.

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.

Flying
Whenever Rimebreath Tyrant attacks, you may discard a card. When you do, tap target creature. It doesn't untap during its controller's next untap step.

Deep-Sea Terror can't attack unless seven or more cards are in your graveyard.

Trample
Other creatures you control get +1/+1 and have trample.