The Mushroom House

The Mushroom House enters the battlefield
tapped unless you control a Fungus.
{t}: Add {r} or {g} to your mana pool.
At the beginning of your upkeep, put a spore
counter on target land without a spore counter.
Lands with spore counters have "{r/g}{r/g}, Sacrifice
this land: Create two 1/1 Fungus creatures."