Big Chungus, the fatso

+20: all your creatures become 12\12 with flying, deathtouch, vigilance, trample, and first strike. This planeswalker has hexproof.
+18: Your opponent loses 20 life, you gain 20 life. you now have hexproof.
+19: All of your creatures gain indestructible, and so does Big Chungus.