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.)
NM-Mint - $12.80
Lightly Played - $11.50
Moderately Played - $10.20
Heavily Played - $9.00
Damaged - $6.40
NM-Mint Non English - $12.80
Lightly Played Non English - $11.50
Moderately Played Non English - $10.20
Heavily Played Non English - $9.00
Damaged Non English - $6.40