Glowing Breeding Grounds

Livind Land 2 - Discard a card (When Breeding Grounds enters the battlefield, it becomes a 2/2 green and blue Germ creature. You may sacrifice a land when this land enters the battlefield, if you do, it gets +2/+2. You may return it back to a noncreature land at anytime by paying its Living Land cost.)
Any player may pay Breeding Ground's Living Land cost. If a player other than you does, put a 4/4 green and blue Germ creature token onto the battlefield.
{t}: Add {g} to your mana pool.