Dominarian Food Chain

Hexproof, Indestructible
All Creatures you control have Cascade.
{w}{u}{b}{r}{g} Exile a Creature: Search your library for a creature card with a converted mana value equal to the mana value of the exiled creature plus 1. Put it on the battlefield tapped.
At the end of your turn, exile each creature you control with the lowest converted mana value.