Elvish Cooperator

Cooperate {2}{g} ( {2}{g}, Reveal this card from your hand: Lands target player controls have "{t} : Add {c} to the revealed card's owner's mana pool." until end of turn.)
Whenever a source an opponent controls adds mana to your mana pool, you may pay {1}. If you do, search your library for a basic land card, reveal it and put it into your hand. Then shuffle your library.