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 - $17.40
Lightly Played - $15.70
Moderately Played - $13.90
Heavily Played - $12.20
Damaged - $8.70
NM-Mint Non English - $17.40
Lightly Played Non English - $15.70
Moderately Played Non English - $13.90
Heavily Played Non English - $12.20
Damaged Non English - $8.70
Foil Prices
NM-Mint Foil - $32.40
Lightly Played Foil - $29.20
Moderately Played Foil - $25.90
Heavily Played Foil - $22.70
Damaged Foil - $16.20
NM-Mint Foil Non English - $32.40
Lightly Played Foil Non English - $29.20
Moderately Played Foil Non English - $25.90
Heavily Played Foil Non English - $22.70
Damaged Foil Non English - $16.20