For each opponent, choose up to one target artifact or enchantment that player controls. For each permanent chosen this way, its controller may exile it. Then if one or more of the chosen permanents are still on the battlefield, you search your library for up to that many land cards, put them onto the battlefield tapped, then shuffle.
When Disorienting Choice resolves, the next opponent in turn order that controls a permanent chosen with Disorienting Choice decides whether or not to exile that permanent. Then each other opponent in turn order does the same. Then all appropriate permanents are exiled simultaneously. Opponents will know what choices opponents earlier in the turn order made.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.