River's Grasp | Magic: The Gathering
Formats River's Grasp is Legal in
Official Oracle Text for River's Grasp
Official Rulings for River's Grasp
5/1/2008 : The spell checks on resolution to see if any mana of the stated colors was spent to pay its cost. If so, it doesn't matter how much mana of that color was spent.
5/1/2008 : If the spell is copied, the copy will never have had mana of the stated color paid for it, no matter what colors were spent on the original spell.
5/1/2008 : When you cast the spell, you choose its targets before you pay for it.