Michelli, the Stone Gardener

When this card enters the battlefield, put a stone counter on target creature. As long as it has a stone counter, it becomes a noncreature artifact with "{t}: add {1} to your mana pool."
Rebirth {3}{w}{w}(Exile this nonreborn creature: Return it to the battlefield reborn with two +1/+1 counters on it. Rebirth only as a sorcery.)