Shadow the Hedgehog

Haste, Menace

Ultimate Lifeform - At the beginning of your
upkeep, choose a creature an opponent controls. If
Shadow the Hedgehog has a higher power or
toughness than that creature, it fights that creature.
If the creature has a higher power and toughness,
put a +1/+1 counter on Shadow the Hedgehog.

"I am the ultimate lifeform."