Nicol Bolas, Warlord

0: Put X loyalty counters on Nicol Bolas, Warlord, where X is the total power of the the Zombie Army you control with the most +1/+1 counters.
-1: Until end of turn Nicol Bolas, Warlord becomes an Elder Dragon with power and toughness both equal to its loyalty. It's still a planeswalker.
-X: Amass X.