Feitiço
Coloque no campo de batalha uma ficha de criatura verde X/X do tipo Lodo, sendo X o maior poder dentre as criaturas que você controla.
The value of X is the greatest power among creatures you control when Miming Slime resolves. If you control no creatures at that time, X will be 0, creating a 0/0 Ooze token that will be put into your graveyard as a state-based action (unless something else is raising its toughness).