Aatrox, The World Ender

Trample, Lifelink

Aatrox gets +X/+X where X is the total mana value of cards exiled with it

As long as a card exiled with Aatrox has flying, he has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, menace, protection, reach, and vigilance.