Cheapest priced copy (Double Masters): $0.35 at Card Kingdom, near mint, their price list as of .
Kuldotha Flamefiend 
Creature — Elemental · 4/4 · Uncommon · Jumpstart 2022 · #565
When this creature enters, you may sacrifice an artifact. If you do, this creature deals 4 damage divided as you choose among any number of targets.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters | 134 | Uncommon | $0.35 | $0.49 |
| Jumpstart 2022 | 565 | Uncommon | $0.35 | — |
| Mirrodin Besieged | 69 | Uncommon | $0.35 | $0.49 |
4 rulings from Wizards of the Coast
- 7 August 2020You don't choose whether to sacrifice an artifact or which artifact you're sacrificing until the ability resolves. Once you decide to sacrifice an artifact (or not), it's too late for players to respond.
- 7 August 2020If some of the targets become illegal for Kuldotha Flamefiend's ability, the original division of damage still applies, but the damage that would have been dealt to illegal targets isn't dealt at all. If all of the targets become illegal, you can't sacrifice an artifact.
- 7 August 2020You may choose zero targets. If you do, Kuldotha Flamefiend deals no damage, but you may sacrifice an artifact.
- 7 August 2020You divide the damage as Kuldotha Flamefiend's triggered ability is put onto the stack, not as it resolves. Each target must be assigned at least 1 damage. You can't choose more than 4 targets and assign 0 damage to a target.