Cascade Forge
Land (Rare)

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

Tap: Add U or R to your mana pool. Cascade Forge deals 1 damage to you.

1R: Cascade Forge becomes a 1/1 blue and red Merfolk creature with first strike until end of turn. It's still a land.

Carl Moeller