Sunken Foundry
Land (Rare)

Sunken Foundry enters the battlefield tapped unless you control one or more creatures.

U, Tap: Add RR to your mana pool.

R, Tap: Add UU to your mana pool.

1R: Sunken Foundry becomes a 1/1 blue and red Shapeshifter creature with first strike until end of turn. It's still a land.

Ron Chan