(: Add or to your mana pool.)

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

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

, : Target land becomes a 2/2 red Shaman Troll creature until end of turn. It's still a land.