Salty Bluffs
Land (Rare)

At the beginning of your end step, if you didn't cast any spells this turn, Salty Bluffs deals 1 damage to you.

U, Tap: Add RR to your mana pool.

R, Tap: Add UU to your mana pool.

1U: Salty Bluffs becomes a 1/1 blue and red Cephalid Faerie creature with flying until end of turn. It's still a land.

Jason Grant West