Cheapest priced copy (Time Spiral Remastered): $0.35 at Card Kingdom, near mint, their price list as of .
Seal of Primordium 
Enchantment · Common · Modern Masters 2017 · #135
Sacrifice this enchantment: Destroy target artifact or enchantment.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
3 printings · $0.35 to $14.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Masters 2017 | 135 | Common | $0.39 | $0.99 |
| Planar Chaos | 153 | Common | $0.59 | $14.99 |
| Time Spiral Remastered | 228 | Common | $0.35 | $1.99 |
2 rulings from Wizards of the Coast
- 4 October 2004This is not modal. If the target changes from an artifact to an enchantment or vice versa, this still destroys it.
- 14 March 2017You can activate Seal of Primordium's ability targeting Seal of Primordium itself if you want it to leave the battlefield. This is because targets are chosen before costs are paid. The ability won't resolve as it tries to resolve.