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 - $20.40
Lightly Played - $16.30
Moderately Played - $14.30
Heavily Played - $12.20
Damaged - $10.20
Near Mint Spanish - $20.40
Lightly Played Spanish - $16.30
Moderately Played Spanish - $14.30
Heavily Played Spanish - $12.20
Damaged Spanish - $10.20