Alduin, the World-Eater

Flying, Double-Strike, Menace, Trample, Indestructible, Thu-um 5
Whenever Alduin, the World-Eater destroys a creature, exile that creature and put a number of +1/+1 counters on Alduin, the World-Eater equal to the exiled creature's power.
{t}{x}: Destroy target creature with converted mana cost x or less.