Ubardeus, The Killer

Whenever Ubardeus, The Killer kills a creature,
he gains +X/+Y, X being that creature's strength and Y being that creature's toughnes. He also gains all abilities that creature had. If Ubardeus, The
Killer destroys a planeswalker, he gains power and toughness equal to that planeswalker's mana cost.
{1}{b}{t}: Ubardeus, The Killer fights target
creature, if he kills it, untap it.
Don't fear death, fear he that brings it