Trypas, Eye of the Branch

+2: Choose two creatures on the battlefield. one creature becomes a 1/1 saproling creature and the other becomes a 4/4 tree until end of turn
-4: Create a 5/5 Trunk creature with "if you don't control a forest permanent, sacrifice this creature"
-8: Exile all creatures on the battlefield, create three times the amount of creatures exiled of 2/2 branch token creatures.