msem-instigator

Target creature you control gains protection from the color of your choice until end of turn. (Then exile this card. You may cast the creature later from exile.)

The next time one or more creatures you control would die this turn, exile those cards. You may play them until the end of your next turn.

Scavenging Soldier has first strike as long as it's attacking.
Attain {3}{W} ({3}{W}: Transform this. Spend at least three colors of mana to activate this, and only as a sorcery.)

When Sheltered Diviner enters the battlefield, each player mills three cards.

When Silver Gardener enters the battlefield, create a 1/1 green Saproling creature token.
Unveil {2}{G}{W} ({2}{G}{W}: Transform this. Unveil only as a sorcery.)

Double strike
Ride {2}{W} ({2}{W}: Transform this and attach it to target creature you control without a Steed. Ride only as a sorcery.)

Disgraced 1 (This enters with a -1/-1 counter. Whenever it deals combat damage to a player, remove all -1/-1 counters from it.)
Attain {3}{W} ({3}{W}: Transform this. Spend at least three colors of mana to activate this, and only as a sorcery.)

Put target attacking or blocking creature on top of its owner's library.
Fuse (You may cast one or both halves of this card from your hand.)

At the beginning of your end step, if you cast no spells this turn, you may return Wrathful Meditant to its owner's hand.