Kobal, Mocking Demon

Kobal, Mocking Demon enters the battlefield with power and toughness equal to any amount of life you may pay in addition to its casting cost.
Embalm {5}{b}{g}{u} ({5}{b}{g}{u}, Exile this card from your graveyard: Create a token that's a copy of it, except it's a 4/4 Black Zombie that says "{ut} : Target player exchanges life total with this creature's toughness" with no mana cost. Embalm only as a sorcery.)