Cheapest priced copy (Duskmourn: House of Horror): $1.49 at Card Kingdom, near mint, their price list as of .
Chainsaw 
Artifact — Equipment · Rare · Duskmourn: House of Horror · #128
When this Equipment enters, it deals 3 damage to up to one target creature.
Whenever one or more creatures die, put a rev counter on this Equipment.
Equipped creature gets +X/+0, where X is the number of rev counters on this Equipment.
Equip {3}
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $1.49 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duskmourn: House of Horror | 128 | Rare | $1.49 | $2.49 |
| Duskmourn: House of Horror | 314 | Rare | $1.79 | $2.99 |
| Duskmourn: House of Horror Promos | 128p | Rare | $2.29 | $2.99 |
| Duskmourn: House of Horror Promos | 128s | Rare | — | $4.99 |