Whenever a commander you control enters the battlefield or attacks, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
Near Mint - $9.30
Lightly Played - $8.40
Played - $6.50
Heavily Played - $5.60
Damaged - $4.70
Near Mint Non-English - $9.30
Lightly Played Non-English - $8.40
Played Non-English - $6.50
Heavily Played Non-English - $5.60
Damaged Non-English - $4.70