Corrin, Dark Princeling

Whenever Corrin attacks or blocks, exile target
card from a graveyard. If that card was a creature
card, put a dragon vein counter on it.
As long as creature card in exile has a dragon vein counter on it has flying, creatures you control
have flying. The same is true for first strike,
double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, protection, reach, trample, and vigilance.