(: Add or to your mana pool.)

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

, : Target land becomes a 3/3 blue Cephalid Wizard creature until end of turn. It's still a land.

, : Seafloor of the Burnwillows deals 1 damage to target creature.