Kenny McCormick

If Kenny McCormick would leave the battlefield, you may Exile him instead. Return him to the battlefield with a +1/+1 counter on him at the beginning of your next upkeep.
Counters remain on Kenny as he moves to any zone other than a player's hand or library.
"Oh my god! They Killed Kenny!"
"You Bastards!" -Stan Marsh and Kyle Broflovski.