Kevin, the Sixth Degree

: Whenever another planeswalker or creature enters the battlefield, put a loyalty counter on Kevin, the Sixth Degree.
-1: Target opponent sacrifices a creature or planeswalker at random. You gain life equal to the sacrificed permanent's mana cost
-12: Choose any number of target permanents, then flip a coin for each of the chosen permanents. Destroy each one whose coin comes up as tails.