Nicol Bolas, Fallen God

Flying
Whenever Nicol Bolas, Fallen God attacks or blocks, put a -1/-1 counter on Nicol Bolas.
Discard a card: Remove a -1/-1 counter from Nicol Bolas.
If Nicol Bolas becomes targeted by a spell, put two -1/-1 counters on Nicol Bolas.