Cheapest priced copy (Aether Revolt): $8.49 at Card Kingdom, near mint, their price list as of .
Paradox Engine 
Legendary Artifact · Mythic · Aether Revolt · #169
Whenever you cast a spell, untap all nonland permanents you control.
Legal inPioneerModernLegacyVintage
Banned inCommander
Not legal inBrawlStandardPauper
3 printings · $8.49 to $129.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Aether Revolt | 169 | Mythic | $8.49 | $17.99 |
| Kaladesh Inventions | 43 | Special | — | $129.99 |
| Aether Revolt Promos | 169s | Mythic | — | $23.99 |
One ruling from Wizards of the Coast
- 9 February 2017Paradox Engine’s triggered ability resolves before the spell that caused it to trigger. The ability will resolve even if that spell is countered.