Aatrox, the World Ender

Flying, Lifelink
If Aatrox deals damage to a player, next time he
would be put into the graveyard, exile him
instead. Return him onto the battlefield at the beginning of your next upkeep with a -7/+0
counter until your next end step.
If Aatrox is put into the graveyard from play,
instead transform Aatrox into Aatrox, the Darkin
Blade and put it into your hand.
"Fight, or be forgotten"