Ytizl, Forsaken Scholar

+1: You may pay 2 life and sacrifice a rat, if you do draw 2 cards
-2: Sacrifice two rats, if you do create a rat creature token named Pack rat, it has power and toughness equal to the number of rats you control
-8: Destroy all rats, for each rat destroyed this was create a rat token named Pack rat, those tokens enter the battlefield tapped