Cheapest priced copy (Outlaws of Thunder Junction Commander): $1.29 at Card Kingdom, near mint, their price list as of .
Dazzling Sphinx 
Creature — Sphinx · 4/5 · Rare · Commander 2021 · #25
Flying
Whenever this creature deals combat damage to a player, that player exiles cards from the top of their library until they exile an instant or sorcery card. You may cast that card without paying its mana cost. Then that player puts the exiled cards that weren't cast this way on the bottom of their library in a random order.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
4 printings · $1.29 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2021 | 25 | Rare | $1.99 | — |
| Commander 2021 | 352 | Rare | $3.99Out of stock | — |
| Outlaws of Thunder Junction Commander | 93 | Rare | $1.29 | — |
| The List | OTC-93 | Rare | — | — |
3 rulings from Wizards of the Coast
- 16 April 2021Dazzling Sphinx's triggered ability lets you cast the exiled card during the resolution of the ability. It doesn't allow you to wait and cast the card later.
- 16 April 2021If the exiled instant or sorcery card has an {X} in its mana cost, you must choose 0 as the value of {X}.
- 16 April 2021You may choose not to cast the instant or sorcery card that you exiled. In that case, it will be put on the bottom of the library with the rest of the exiled cards.