Chrollo Lucilfer, Nen Looter

If a nontoken creature would die, exile that card
with a blood counter on it instead.

As long as an exiled creature card with a blood counter on it has flying, Chrollo Lucilfer has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, protection, reach, trample, and vigilance.