Animal Shapes

When Animal Shapes enters the battlefield exile X creatures you control then you may choose X creature cards from your library, your opponents' library, a graveyard, or from out of the game with maximum non combined converted mana cost equal to 2 more than the creature exiled with the greatest converted mana cost. Put those creatures onto the battlefield paired with a creature that was exiled. Whenever a paired creature dies return the creature that it was paired with to the battlefield from exile, those