Misty Caldera
Land-Island Mountain (Rare)

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

When Misty Caldera enters the battlefield, return a land you control to its owner's hand.

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

2RR, Tap: Misty Caldera deals 1 damage to target creature.

Steve Guay