Magnetic Mine — ruling 1

Magnetic 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.

Magnetic Mine : règles, fonctionnement et interactions (MTG)

Magnetic Mine is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Whenever another artifact is put into a graveyard from the battlefield, this artifact deals 2 damage to that artifact's controller.

How it works : Magnetic Mine

Original English text — Wizards of the Coast / Scryfall

#1June 1, 2011· Wizards of the Coast
Magnetic 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.
No other card is named in this ruling.