Cheapest priced copy (Secrets of Strixhaven): $0.35 at Card Kingdom, near mint, their price list as of .
Ajani's Response 
Instant · Common · Secrets of Strixhaven · #6
This spell costs {3} less to cast if it targets a tapped creature.
Destroy target creature.
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Secrets of Strixhaven | 6 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 20 March 2026To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Ajani's Response's first ability). The mana value of the spell is determined by only its mana cost, no matter what the total cost to cast that spell was.