Temple of Avacyn

Indestructible, Protection from Instants
When Temple of Avacyn enters the battlefield, exile a Basic Land.
Temple of Avacyn enters the battlefield with 6 counters.
{t}: Add three mana of the same type as the exiled Basic Land.
Whenever Temple of Avacyn is tapped for mana, remove one counter. When the count reaches 0, you may pay {w}{w}{w}{b}{b}{b}{r}{r}{r}{g}{g}{g} to transform this into Avacyn, Reborn.