Misty Jungle
Land (Rare)

Misty Jungle enters the battlefield tapped unless you control five or more creatures.

Tap: Add G or U to your mana pool.

Sacrifice Misty Jungle: Add G or U to your mana pool.

GU: Misty Jungle becomes a 2/1 blue and green Crab creature until end of turn. It's still a land.

Steve Tedin