Cumulative upkeep {1} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) 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 Corrosion leaves the battlefield, remove all rust counters from all permanents.
NM-Mint - $1.30
NM-Mint Non English - $1.30
Lightly Played - $1.30
Lightly Played Non English - $1.30
Moderately Played - $1.20
Moderately Played Non English - $1.20
Heavily Played - $1.10
Heavily Played Non English - $1.10
Damaged - $0.90
Damaged Non English - $0.90