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 - $14.700
Lightly Played - $11.800
Moderately Played - $10.300
Heavily Played - $8.800
Damaged - $7.400
Near Mint Spanish - $14.700
Lightly Played Spanish - $11.800
Moderately Played Spanish - $10.300
Heavily Played Spanish - $8.800
Damaged Spanish - $7.400