Grounds of Rebirth

{r}{r}{r}, {t}: Put a Birth Counter on Grounds of
Rebirth.
{r}, {t}, Remove {x} Birth Counters from Grounds
of Rebirth: Return target Phoenix creature card
with converted mana cost less than or equal to
{x} from your graveyard to the battlefield. Then,
if Grounds of Rebirth has no Birth Counters on
it, sacrifice Grounds of Rebirth.