Mystic Meadows

({t}: Add {g} to your mana pool.)
Mystic Meadows enters the battlefield tapped.
{5}{g}{t}, Exile Mystic Meadows, discard a card in your hand named Mystic Meadows: Choose a green creature card you own from outside the game. Reveal that card and put it into your hand.
Cards chosen with Mystic Meadows cost {3} less to play as long as Mystic Meadows is in exile.