Bloodstained Seafloor
Land-Island Mountain (Rare)

(Tap: Add U or R to your mana pool.)

Bloodstained Seafloor enters the battlefield tapped unless you reveal a creature card from your hand.

RR, Tap: Target red creature gets +1/+1 until end of turn.

2, Tap: Target land becomes a 3/3 blue Crab creature until end of turn. It's still a land.

Allan Prescott