Corrosion
About this card
Corrosion is an enchantment card in Magic: The Gathering with mana value 3 (color identity: black and red). Printed in Visions (1997). Legal in Commander, Legacy and Vintage. Cardmarket price: €1.20. It is on the Reserved List: Wizards will not reprint it.
Corrosion 


At the beginning of your upkeep, put a rust counter on each artifact target opponent controls. Then destroy each artifact with mana value less than or equal to the number of rust counters on it. Artifacts destroyed this way can't be regenerated.
When this enchantment leaves the battlefield, remove all rust counters from all permanents.
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Legality
Rulings
2006-02-01
Only puts rust counters on artifacts your opponents control, but destroys all artifacts with rust counters on them, even your own. When it leaves the battlefield, it removes all rust counters, not just those that happen to be on artifacts.
2004-10-04
It does count rust counters put on artifacts by other Corrosion cards. This means that having more than one of these can result in fast destruction of artifacts.
2004-10-04
In multiplayer games, you can choose a new target player each upkeep.