Kai'sa, Daughter of the Void

Haste, evolve
Creatures your opponents control with plasma
counters on them cannot block this creature.
Whenever Kai'sa attacks, put a plasma counter
on target creature an opponent controls.
Whenever there are four or more plasma
counters on creatures your opponents control,
exile Kai'sa, Daughter of the void, and return
her to the battlefield transformed under your
control.