Aporthos, Forlorn Flame

Flying, Menace
When Aporthos, Forelorn Flame enters or leaves the battlefield, destroy target noncreature permanent opponent controls.
Aporthos gets +3/+3 and gains annihilator 1 if it is the only creature on the battlefield under your control.
Aporthos gets -4/-4 and loses menace as long as you control 1 or more other creatures.