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 - $17.00
Lightly Played - $15.30
Played - $11.90
Heavily Played - $10.20
Damaged - $8.50
Near Mint Non-English - $17.00
Lightly Played Non-English - $15.30
Played Non-English - $11.90
Heavily Played Non-English - $10.20
Damaged Non-English - $8.50