Cheapest priced copy (The Brothers' War Retro Artifacts): $3.49 at Card Kingdom, near mint, their price list as of .
Blackblade Reforged 
Legendary Artifact — Equipment · Rare · Dominaria · #211
Equipped creature gets +1/+1 for each land you control.
Equip legendary creature {3}
Equip {7}
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
12 printings · $3.49 to $44.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Brothers' War Retro Artifacts | 6 | Rare | $3.49 | $6.99 |
| The Brothers' War Retro Artifacts | 69 | Rare | $4.49 | $9.99 |
| The Brothers' War Retro Artifacts | 69z | Rare | — | — |
| Commander Legends | 457 | Rare | $3.99 | — |
| Dominaria United Commander | 178 | Rare | $3.99 | — |
| Dominaria | 211 | Rare | $4.49 | $7.99 |
| Neon Dynasty Commander | 146 | Rare | $3.49 | — |
| Dominaria Promos | 211p | Rare | $5.49 | $44.99 |
| Dominaria Promos | 211s | Rare | — | $10.99 |
| The List | SS2-8 | Rare | $4.99 | — |
| Signature Spellbook: Gideon | 8 | Rare | $5.49 | $16.99 |
| Zendikar Rising Commander | 107 | Rare | $3.49 | — |
2 rulings from Wizards of the Coast
- 27 April 2018Whether the target creature is legendary is checked only as Blackblade Reforged's first equip ability is activated and as that ability resolves. If the creature somehow becomes nonlegendary later, Blackblade Reforged remains attached to it.
- 27 April 2018"Equip [quality] creature" is a variant of the equip keyword. "Equip [quality] creature [cost]" means "[Cost]: Attach this Equipment to target [quality] creature you control. Activate only as a sorcery."