Planechase 2012 (PC2) 

Creature - Bird Skeleton 

/1 

Flying // {B}: Regenerate Kathari Remnant. // Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.) 

Anthony S. Waters