Cheapest priced copy (Khans of Tarkir): $0.99 at Card Kingdom, near mint, their price list as of .
Retribution of the Ancients 
Enchantment · Rare · Khans of Tarkir · #85
{B}, Remove X +1/+1 counters from among creatures you control: Target creature gets -X/-X until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.99 to $5.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Khans of Tarkir | 85 | Rare | $0.99 | $5.99 |
One ruling from Wizards of the Coast
- 20 September 2014Once you announce that you are activating the ability of Retribution of the Ancients, no player may take any actions before you pay its costs. Notably, opponents can’t try to remove a creature with counters on it to stop you from paying.