Cheapest priced copy (Mirrodin Besieged): $0.49 at Card Kingdom, near mint, their price list as of .
Magnetic Mine 
Artifact · Rare · Mirrodin Besieged · #113
Whenever another artifact is put into a graveyard from the battlefield, this artifact deals 2 damage to that artifact's controller.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.49 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirrodin Besieged | 113 | Rare | $0.49 | $0.79 |
One ruling from Wizards of the Coast
- 1 June 2011Magnetic Mine will not trigger when it is put into a graveyard from the battlefield itself, although it will trigger if another artifact is put into the graveyard from the battlefield at the same time.