Cheapest priced copy (Duel Decks: Sorin vs. Tibalt): $0.35 at Card Kingdom, near mint, their price list as of .
Sorin's Thirst 
Instant · Common · Core Set 2020 · #325
Sorin's Thirst deals 2 damage to target creature and you gain 2 life.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
4 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Sorin vs. Tibalt | 21 | Common | $0.35 | — |
| Magic 2012 | 110 | Common | $0.35 | $0.49 |
| Core Set 2020 | 325 | Common | $0.35 | — |
| War of the Spark | 104 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 12 July 2019If the target creature is an illegal target by the time Sorin’s Thirst tries to resolve, the spell doesn’t resolve. You won’t gain 2 life.