Choose any target. Scry 3, then reveal the top card of your library. Riddle of Lightning deals damage equal to that card's converted mana cost to that permanent or player. (To scry 3, look at the top three cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)
NM-Mint - $0.10
NM-Mint Non English - $0.10
Lightly Played - $0.10
Lightly Played Non English - $0.10
Moderately Played - $0.10
Moderately Played Non English - $0.10
Heavily Played - $0.10
Heavily Played Non English - $0.10
Damaged - $0.10
Damaged Non English - $0.10