Cheapest priced copy (Forgotten Realms Commander): $1.29 at Card Kingdom, near mint, their price list as of .
Fiendlash 
Artifact — Equipment · Uncommon · Commander Masters · #221
Equipped creature gets +2/+0 and has reach.
Whenever equipped creature is dealt damage, it deals damage equal to its power to target player or planeswalker.
Equip {2}{R}
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $1.29 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Forgotten Realms Commander | 31 | Rare | $1.29 | — |
| Forgotten Realms Commander | 300 | Rare | $3.49 | — |
| Commander Masters | 221 | Uncommon | $1.29 | $2.99 |
2 rulings from Wizards of the Coast
- 23 July 2021If the equipped creature isn't on the battlefield as the triggered ability resolves but it had lifelink when it left the battlefield, you will gain life.
- 23 July 2021Use the equipped creature's power as the triggered ability resolves to determine how much damage is dealt. If the equipped creature is no longer on the battlefield at that time, use its power as it last existed on the battlefield.