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 - $6.10
Lightly Played - $5.80
Moderately Played - $5.50
Heavily Played - $4.90
Damaged - $4.00
NM-Mint Non English - $6.10
Lightly Played Non English - $5.80
Moderately Played Non English - $5.50
Heavily Played Non English - $4.90
Damaged Non English - $4.00