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 - $9.00
Lightly Played - $8.50
Moderately Played - $7.25
Heavily Played - $5.50
Damaged - $4.50
Near Mint Non-English - $9.00
Lightly Played Non-English - $8.50
Moderately Played Non-English - $7.25
Heavily Played Non-English - $5.50
Damaged Non-English - $4.50