Ethereal Grove

Ethereal Grove comes into play tapped unless
you control at least 3 different basic lands in any combination of Forest, Plains, Island, and Swamp
When Ethereal Grove comes into play, sacrifice it unless you pay {1}.
{t}:Add {g},{w},{u}, or {b} to your mana pool.
A hushed harmony trickles through this blessed forest-bed of those who came before.