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.)
Near Mint - $21.00
Near Mint Non-English - $21.00
Lightly Played - $20.00
Lightly Played Non-English - $20.00
Moderately Played - $16.75
Moderately Played Non-English - $16.75
Heavily Played - $12.75
Heavily Played Non-English - $12.75
Damaged - $10.50
Damaged Non-English - $10.50