Cheapest priced copy (Secrets of Strixhaven): $0.49 at Card Kingdom, near mint, their price list as of .
Vicious Rivalry 
Sorcery · Rare · Secrets of Strixhaven Promos · #241p
As an additional cost to cast this spell, pay X life.
Destroy all artifacts and creatures with mana value X or less.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
3 printings · $0.49 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Secrets of Strixhaven Promos | 241p | Rare | $0.59 | $0.49 |
| Secrets of Strixhaven | 241 | Rare | $0.49 | $0.79 |
| Secrets of Strixhaven | 359 | Rare | $0.99 | $0.99 |
One ruling from Wizards of the Coast
- 20 March 2026If a permanent has {X} in its mana cost, X is 0 for the purpose of determining its mana value.