Cheapest priced copy (Core Set 2021): $0.35 at Card Kingdom, near mint, their price list as of .
Gloom Sower 
Creature — Horror · 8/6 · Common · Core Set 2021 · #100
Whenever this creature becomes blocked by a creature, that creature's controller loses 2 life and you gain 2 life.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Core Set 2021 | 100 | Common | $0.35 | $0.49 |
| The List | M21-100 | Common | $0.35 | — |
One ruling from Wizards of the Coast
- 23 June 2020If the creature that blocked Gloom Sower leaves the battlefield before Gloom Sower's triggered ability resolves, the player who controlled it before it left is the player who loses 2 life.