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.)
"Is that your coat of arms? Looks more like a shawl of branches to me!"
—Andreas the Imprudent, last words
Near Mint - $29.700
Lightly Played - $23.800
Moderately Played - $20.800
Heavily Played - $17.900
Damaged - $14.900
Near Mint Spanish - $29.700
Lightly Played Spanish - $23.800
Moderately Played Spanish - $20.800
Heavily Played Spanish - $17.900
Damaged Spanish - $14.900