Cheapest priced copy (Ikoria: Lair of Behemoths): $0.35 at Card Kingdom, near mint, their price list as of .
Clash of Titans 
Instant · Uncommon · Ikoria: Lair of Behemoths · #111
Target creature fights another target creature. (Each deals damage equal to its power to the other.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ikoria: Lair of Behemoths | 111 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 17 April 2020If either target is an illegal target as Clash of Titans tries to resolve, neither creature will deal or be dealt damage.
- 17 April 2020Clash of Titans can target two creatures controlled by the same player.