Luna's Scrollodex

Whenever you would shuffle your library, instead choose an opponent at random. That player cuts your library, then reveals the bottom card of the top half to each other player. Then, put the top half beneath the bottom half. (As long as your library is cut into two parts, proportions don't matter.)
"Pity upon the squanderer of either news or rain in the desert summers." — Clathbart, the Younger