Cheapest priced copy (The Brothers' War Commander): $6.49 at Card Kingdom, near mint, their price list as of .
Blast-Furnace Hellkite 
Creature — Dragon · 5/5 · Rare · The Brothers' War Commander · #12
Artifact offering (You may cast this spell as though it had flash by sacrificing an artifact and paying the difference in mana costs between this and the sacrificed artifact. Mana cost includes color.)
Flying, double strike
Creatures attacking your opponents have double strike.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $6.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Brothers' War Commander | 12 | Rare | $6.49 | — |
| The Brothers' War Commander | 59 | Rare | $6.49 | — |
2 rulings from Wizards of the Coast
- 14 October 2022Blast-Furnace Hellkite’s last ability applies to any creature that is attacking one of your opponents, even if another opponent controls that creature.
- 14 October 2022When you cast a spell with offering by sacrificing a permanent, generic mana in the sacrificed permanent’s mana cost reduces only generic mana in the spell’s total cost. Colored and colorless mana in the sacrificed permanent’s mana cost reduces mana of the same type in spell’s total cost, and any excess reduces the spell’s total cost by that much generic mana. The total cost of the spell can’t be reduced to less than {0}.