Cheapest priced copy (Fate Reforged): $0.35 at Card Kingdom, near mint, their price list as of .
Ancestral Vengeance 
Enchantment — Aura · Common · Fate Reforged · #61
Enchant creature
When this Aura enters, put a +1/+1 counter on target creature you control.
Enchanted creature gets -1/-1.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Fate Reforged | 61 | Common | $0.35 | $0.49 |
| The List | FRF-61 | Common | $0.35 | — |
2 rulings from Wizards of the Coast
- 24 November 2014If Ancestral Vengeance causes the enchanted creature to have toughness 0, that creature and Ancestral Vengeance will be put into their owners' graveyards. The enters-the-battlefield ability will still apply.
- 24 November 2014If the creature targeted by Ancestral Vengeance's enchant creature ability is an illegal target as Ancestral Vengeance tries to resolve, Ancestral Vengeance won't resolve. It won't enter the battlefield, and its enters-the-battlefield ability won't trigger.