Avacyn, the Flamecaller

Flying, lifelink
Eminence -- Whenever you cast an instant or sorcery spell, put a flame counter on Avacyn, the Flamecaller. You may remove a counter at any time you could cast an instant to deal 3 damage to any target.
If Avacyn, the Flamecaller has 10 or more flame counters, instant and sorcery spells you cast have lifelink.