C.A.T. the undying

as an additional cost to cast this spell sacrifice 20 nontoken nonland permanents
If a cat would leave any zone or the stack Instead put that cat onto the battlefield phased out until end of turn
Hexproof, Indestructible protection from everything, shroud
whenever C.A.T. deals combat damage to a player that player loses the game
{5}Sacrifice 5 nontoken nonland permanents: C.A.T. becomes a creature until end of turn