Breeding Marsh
Land (Rare)

When Breeding Marsh enters the battlefield, sacrifice it unless you pay 2 life.

Tap, Pay 1 life: Add G or U to your mana pool.

1, Tap, Sacrifice Breeding Marsh: Draw a card.

2G: Breeding Marsh becomes a 2/2 green and blue Snake creature with trample until end of turn. It's still a land.

Steve Tedin