Aatrox, World-Ender

Vigilance, Flying, First Strike, Haste, Trample
If Aatrox, World-Ender would leave the battlefield, instead put a -1/1 counter on him
At the beginning of your end step if Aatrox,
World-Ender was transformed this turn then
destroy all nonland permanents
Insects, the World-Ender has come!