Each creature gets +1/+1 for each other creature on the battlefield that shares at least one creature type with it. (For example, if two Goblin Warriors and a Goblin Shaman are on the battlefield, each gets +2/+2.)
NM-Mint - $20.50
NM-Mint Non English - $20.50
Lightly Played - $19.50
Lightly Played Non English - $19.50
Moderately Played - $18.40
Moderately Played Non English - $18.40
Heavily Played - $16.40
Heavily Played Non English - $16.40
Damaged - $13.30
Damaged Non English - $13.30