Trekking Temple

As long as Trekking Temple has no Fertile
counter on it, it isn't a land.
When Trekking Temple enters the battlefield
from exile, put a Fertile counter on it.
Whenever a permanent returns to the battlefield
from exile under your control, you may draw a
card and untap it.
{t}: Add {w}{u}{g} to your mana pool, activate this ability only if Trekking Temple has a Fertile
counter on it.