Seafloor-wood
Land (Rare)

Seafloor-wood enters the battlefield tapped.

Tap: Add G or U to your mana pool.

Tap: Add 2 to your mana pool. Put Seafloor-wood on top of your library.

2G: Seafloor-wood becomes a 2/2 green and blue Crab creature with trample until end of turn. It's still a land.

Carl Chan