FOILCheapest priced copy (Kaladesh): $0.49 at Card Kingdom, near mint, their price list as of .
Dubious Challenge 
Sorcery · Rare · Kaladesh Promos · #152s
Look at the top ten cards of your library, exile up to two creature cards from among them, then shuffle. 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.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.49 to $0.59 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Kaladesh | 152 | Rare | $0.49 | $0.49 |
| Kaladesh Promos | 152s | Rare | — | $0.59 |
5 rulings from Wizards of the Coast
- 20 September 2016You may choose to exile only one creature card. If you do, the target opponent chooses who gets the card.
- 20 September 2016The cards that you look at but don't exile never leave your library. They're shuffled along with the rest of your library.
- 20 September 2016In a multiplayer game, you must choose the target opponent before you look at your top ten cards and decide what to exile.
- 20 September 2016The creature cards you exile are face up. Your opponent can see them while deciding whether to take one and which to take.
- 20 September 2016You may choose to exile no creature cards, even if there are one or more among the top ten cards of your library.