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.)
"Hup, two, three, four,
Dunno how to count no more."
—Mogg march
NM-Mint - $16.80
Lightly Played - $15.20
Moderately Played - $13.50
Heavily Played - $11.80
Damaged - $8.40
NM-Mint Non English - $16.80
Lightly Played Non English - $15.20
Moderately Played Non English - $13.50
Heavily Played Non English - $11.80
Damaged Non English - $8.40
Foil Prices
NM-Mint Foil - $25.90
Lightly Played Foil - $23.30
Moderately Played Foil - $20.70
Heavily Played Foil - $18.10
Damaged Foil - $13.00
NM-Mint Foil Non English - $25.90
Lightly Played Foil Non English - $23.30
Moderately Played Foil Non English - $20.70
Heavily Played Foil Non English - $18.10
Damaged Foil Non English - $13.00