Cheapest priced copy (Iconic Masters): $0.59 at Card Kingdom, near mint, their price list as of .
Eternal Thirst 
Enchantment — Aura · Common · The List · #IMA-89
Enchant creature
Enchanted creature has lifelink and "Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature." (Damage dealt by a creature with lifelink also causes its controller to gain that much life.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
4 printings · $0.59 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Iconic Masters | 89 | Common | $0.59 | $0.99 |
| Jumpstart | 229 | Common | $0.59Out of stock | — |
| Magic 2015 | 95 | Common | $0.59 | $2.49 |
| The List | IMA-89 | Common | $0.69 | — |
2 rulings from Wizards of the Coast
- 17 November 2017If the enchanted creature is dealt lethal damage at the same time as a creature an opponent controls, they’re destroyed at the same time. It won’t receive a +1/+1 counter from its ability in time to save it.
- 17 November 2017Multiple instances of lifelink on the same creature are redundant.