Rosaria, Nest Guardian

For each color used to pay for Rosaria an
opponent scrafices a creature.
At the begging of combat, create a 0/3 acid cloud creature token with defender and death touch for
each attacking creature until end of turn.
If a legendary creature named Esme is on the battlefied, you gain control of her.
If esme is moved to the graveyard, no one can win
the game.
Hexproof, Indestructible.