Sorcery, 3{U/B} (4)

If {U} was spent to cast River's Grasp, return up to one target creature to its owner's hand. If {B} was spent to cast River's Grasp, target player reveals his or her hand, you choose a nonland card from it, then that player discards that card. (Do both if {U}{B} was spent.)

Illus. Steven Belledin