Cheapest priced copy (Dominaria): $0.49 at Card Kingdom, near mint, their price list as of .
Forebear's Blade 
Artifact — Equipment · Rare · The List · #DOM-214
Equipped creature gets +3/+0 and has vigilance and trample.
Whenever equipped creature dies, attach this Equipment to target creature you control.
Equip {3}
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.49 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Masters | 384 | Uncommon | $0.69 | $0.79 |
| Dominaria | 214 | Rare | $0.49 | $0.79 |
| Dominaria Promos | 214p | Rare | $2.29 | $3.99 |
| Dominaria Promos | 214s | Rare | — | $1.49 |
| The List | DOM-214 | Rare | $0.49 | — |
One ruling from Wizards of the Coast
- 27 April 2018If there's no target for the triggered ability of Forebear's Blade, or if the ability's target becomes illegal, Forebear's Blade remains on the battlefield unattached.