Cheapest priced copy (Double Masters 2022): $0.35 at Card Kingdom, near mint, their price list as of .
Livewire Lash 
Artifact — Equipment · Rare · Scars of Mirrodin · #172
Equipped creature gets +2/+0 and has "Whenever this creature becomes the target of a spell, this creature deals 2 damage to any target."
Equip {2}
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters 2022 | 307 | Uncommon | $0.35 | $0.49 |
| Scars of Mirrodin | 172 | Rare | $0.49 | $2.49 |
2 rulings from Wizards of the Coast
- 1 January 2011When the equipped creature becomes the target of a spell, the ability granted to it by Livewire Lash will trigger and go on the stack on top of it. It will resolve before the spell does.
- 1 January 2011The equipped creature is the source of both the triggered ability and the resultant damage, not Livewire Lash. For example, you can target and deal damage to a creature with protection from artifacts (assuming the equipped creature isn't an artifact itself, of course).