Aatrox, The World Ender

Flying, Haste, Indestructible, Menance, Trample.
At the start of each player's turn, they gain
control of this creature.
This creature must attack each turn if able.
If this card were to be put into the graveyard,
shuffle this card into your library
When this card is drawn, it comes into play.
"As long as life exists, as long as time has
meaning, I am not done!"