Cheapest priced copy (Khans of Tarkir): $5.49 at Card Kingdom, near mint, their price list as of .
Stubborn Denial 
Instant · Uncommon · Khans of Tarkir · #56
Counter target noncreature spell unless its controller pays {1}.
Ferocious — If you control a creature with power 4 or greater, counter that spell instead.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $5.49 to $34.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Khans of Tarkir | 56 | Uncommon | $5.49 | $34.99 |
| Secret Lair Drop | 8500 | Rare | — | — |
2 rulings from Wizards of the Coast
- 20 September 2014Some ferocious abilities that appear on instants and sorceries use the word “instead.” These spells have an upgraded effect if you control a creature with power 4 or greater as they resolve. For these, you only get the upgraded effect, not both effects.
- 20 September 2014Ferocious abilities of instants and sorceries that don’t use the word “instead” will provide an additional effect if you control a creature with power 4 or greater as they resolve.