Hag's Barter

Bargain (Choose an opponent. That player looks
at the top two cards of your library, then sets one
card in a face-down pile and the other in a
face-up pile. Choose a pile to put in your hand
and put the other pile into your graveyard.
Repeat this process, reversing each player's role.)
"Step right up, sonny! What can I do you do for?"