Friary in the Sky

Friary in the Sky enters the battlefield tapped.
It doesn't untap during its controller's untap step, unless there are three or more docility counters on it.
Whenever a Monk enters the battlefield under your control, put a docility counter on Friary in the Sky.
{t}: Add {w}{u}{r}. Spend this mana only to cast noncreature spells.