Cheapest priced copy (Darksteel): $0.35 at Card Kingdom, near mint, their price list as of .
Leonin Bola 
Artifact — Equipment · Common · Darksteel · #127
Equipped creature has "{T}, Unattach Leonin Bola: Tap target creature."
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Darksteel | 127 | Common | $0.35 | $0.49 |
| Salvat 2005 | L16 | Common | — | — |
3 rulings from Wizards of the Coast
- 1 December 2004Leonin Bola grants an ability to the equipped creature. The ability can target a creature with protection from artifacts (unless the equipped creature is an artifact creature).
- 1 December 2004“Unattach Leonin Bola” means just that — Leonin Bola moves off the creature it was equipping and remains on the battlefield.
- 1 December 2004The equipped creature’s controller chooses whether or not to activate the activated ability. It doesn’t matter who controls Leonin Bola.