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 - $21.50
NM-Mint Non English - $21.50
Lightly Played - $20.40
Lightly Played Non English - $20.40
Moderately Played - $19.30
Moderately Played Non English - $19.30
Heavily Played - $17.20
Heavily Played Non English - $17.20
Damaged - $14.00
Damaged Non English - $14.00