Miming Slime

Create an X/X green Ooze creature token, where X is the greatest power among creatures you control.

Pioneer Masters

"We paid the Simic very well for this capability, but we should quickly recoup our expenses in saved wages."
—Milana, Orzhov prelate

RNA Guild Kit

Ultimate Masters

Gatecrash

Put an X/X green Ooze creature token onto the battlefield, where X is the greatest power among creatures you control.

The power and toughness of the Ooze token is determined when Miming Slime resolves. It won’t change as the greatest power among creatures you control changes.

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).