Cheapest priced copy (Tarkir: Dragonstorm Promos): $2.99 at Card Kingdom, near mint, their price list as of .
Dragonfire Blade 
Artifact — Equipment · Rare · Tarkir: Dragonstorm Promos · #240p
Equipped creature gets +2/+2 and has hexproof from monocolored.
Equip {4}. This ability costs {1} less to activate for each color of the creature it targets.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $2.99 to $7.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tarkir: Dragonstorm Promos | 240p | Rare | $2.99 | $3.49 |
| Tarkir: Dragonstorm Promos | 240s | Rare | — | $5.49 |
| Tarkir: Dragonstorm | 240 | Rare | $2.99 | $3.49 |
| Tarkir: Dragonstorm | 324 | Rare | $3.49 | $7.99 |