Bowser,King of the Koopa

Trample.
Bowser, King of the Koopas attacks,create one 1/1 Koopa creature token.
{b}{b}: Sacrifice X Koopa creatures. Bowser,
King of the Koopa gains +X/+0 until
end of turn, where X is the number of Koopa creatures sacrificed this way."
"Behold, the mighty ruler of the Koopa! Tremble before my might!"