Cheapest priced copy (Commander Legends): $0.35 at Card Kingdom, near mint, their price list as of .
Spark Harvest 
Sorcery · Common · Commander Legends · #150
As an additional cost to cast this spell, sacrifice a creature or pay {3}{B}.
Destroy target creature or planeswalker.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends | 150 | Common | $0.35 | $0.49 |
| War of the Spark | 105 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 10 November 2020You must sacrifice exactly one creature or pay an extra {3}{B} to cast this spell; you can't cast it without paying one of those costs, and you can't pay either multiple times. Players can respond to Spark Harvest only after it's been cast and all its costs have been paid. No one can try to destroy the creature you sacrificed to stop you from casting this spell or to make it cost more mana.