Megaman X - Maverick Hunter

Megaman X's Power and Toughness are each equal X.

Vigilance

If Megaman X deals letal damage to a creature an
opponent controls, he becomes the color of that creature
and gain it's effects. You can spend mana as though it
were any color to activate Megaman X's abilities.

{t}: Megaman deals damage equals its power to a
target creature an opponent control.