Midgardsormr, the Windwyrm

Flying, Trample
Shapeshift {2}{g} ({2}{g} Exile an attacker you
control until Midgardsormr, the Windwyrm
leaves the battlefield. Put this card onto the battlefield tapped and attacking) When Midgardsormr, the Windwyrm enters the battlefield, if it entered tapped it deals
damage equal to it's power to another creature.
"Ah, perfect. I just felt boredom's onset."