Dubious Challenge
Oracle Text
Look at the top ten cards of your library, exile up to two creature cards from among them, then shuffle your library. Target opponent may choose one of the exiled cards and put it onto the battlefield under their control. Put the rest onto the battlefield under your control.
Card Rulings
9/20/2016 The creature cards you exile are face up. Your opponent can see them while deciding whether to take one and which to take.
9/20/2016 You may choose to exile only one creature card. If you do, the target opponent chooses who gets the card.
9/20/2016 You may choose to exile no creature cards, even if there are one or more among the top ten cards of your library.
9/20/2016 The cards that you look at but don’t exile never leave your library. They’re shuffled along with the rest of your library.
9/20/2016 In a multiplayer game, you must choose the target opponent before you look at your top ten cards and decide what to exile.
As for the phrasing 'the rest', this is in case you only pick one creature, in which case 'the rest' is nothing.
EDIT: Should have been a reply to YumaHate. Not sure what happened.
Suuuuper weird card. Huh.
is one of the ways I could understand this actually being cast
Brooding Saurian is the other
but if all you care about is tournament formats, yeah It probably won't go anywhere barring something very odd.