Polymorphic Butterwing

Flying
When you cast Polymorphic Butterwing, sacrifice a creature with power of 2 or less or counter
Polymorphic Butterwing.
When Polymorphic Butterwing dies, exile cards
from the top of your library until you reveal a
creature card with power of 2 or less, then put it
into play tapped. Put the exiled cards on the
bottom of your library in a random order.