Gregory, The Undying

{t}: Add {b} or {g}.
If Gregory would have entered the graveyard
at anytime, instead return it to the
battlefield tapped with a +1/+1 counter on
it. It does not untap during its untap phase,
and it instead has
'{t}: Add {b}{b}{g}{g}'.
You may Pay {u}{u} to untap Gregory.