Pennywise, The Dancing Clown

Vigilance, skulk
Whenever Pennywise, the Dancing Clown enters the battlefield, create a Balloon token. (It's a red artifact with "2B, T, Sacrifice this artifact: Destroy target creature with power 2 or less.")
3{b}:Exile Pennywise, the Dancing Clown until your next upkeep step. Activate only as a sorcery.