msem-instigator

Double strike

Vigilance
This spell costs {1} less to cast for each +1/+1 counter among creatures you control.

Destroy target creature if it has the least power or is tied for least power among creatures on the battlefield.
Memento {3}{B}{B} (You may cast this from your graveyard for {3}{B}{B}. If you do, put it onto the battlefield transformed after it resolves. Exile it if it would leave the battlefield or not resolve.)

Sacrifice a land: Desperate Ravager gets +2/+0 and gains haste until end of turn.

Trample
Creatures your opponents control get -1/-0.

Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
When Determined Koi has three or more +1/+1 counters on it, remove them all and transform it.

Menace
When Devious Kalku enters the battlefield, you may search your library for a card, put that card into your graveyard, then shuffle.

Hexproof

Hexproof

Whenever you or a creature you control become the target of a spell or ability an opponent controls, that opponent gets a spite counter.

Scry X. (Then exile this card. You may cast the creature later from exile.)

Spells your opponents cast cost {1} more to cast.
Spells you cast cost {1} less to cast.

At the beginning of your end step, if you have no cards in hand, draw a card.
{2}{U}, {T}: Sacrifice any number of nontoken creatures. Create an X/X blue Horror creature token for each of those creatures, where X is the total power of those creatures.

Target creature gets +1/+3 and gains hexproof until end of turn. (Then exile this card. You may cast the creature later from exile.)

Flying
Ride {3}{U} ({3}{U}: Transform this and attach it to target creature you control without a Steed. Ride only as a sorcery.)

Dramatic Peril deals damage equal to the number of lands you control to any target. (Cast a copy of this spell once while this creatures is on the battlefield.)

When Drop Bear enters the battlefield, return another target permanent that isn't a land an opponent controls or a card in a graveyard to its owner's hand.

Reach

Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
When Eager Hatchling has three or more +1/+1 counters on it, remove them all and transform it.

Target player reveals their hand. You choose a nonland card from it. That player discards that card.

If a spell or ability an opponent controls causes you to discard Edgar, put it onto the battlefield instead of putting it into your graveyard.
Unveil {4}{G}{W} ({4}{G}{W}: Transform this. Unveil only as a sorcery.)

At the beginning of your end step, draw a card for each card you drew this turn.

For each color of mana spent to cast this spell, create a 0/2 green Egg creature token.

Whenever Ekebram the Scholar becomes untapped, draw a card.
Whenever you draw your third card each turn, you may transform Ekebram.