Sea Ampitheater
Land (Rare)

Sea Ampitheater enters the battlefield tapped.

Tap: Add U or R to your mana pool.

Tap: Add 2 to your mana pool. Put Sea Ampitheater on top of your library.

UR: Sea Ampitheater becomes a 2/1 blue and red Merfolk creature until end of turn. It's still a land.

Greg Moeller