Corrosion

Enchantment

Cumulative upkeep

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.

Corrosion is on the reserved list, which means WOTC has self-imposed restrictions from making functional reprints of this card.