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 - $4.70
Lightly Played - $4.50
Moderately Played - $4.20
Heavily Played - $3.80
Damaged - $3.10
NM-Mint Non English - $4.70
Lightly Played Non English - $4.50
Moderately Played Non English - $4.20
Heavily Played Non English - $3.80
Damaged Non English - $3.10