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 Foil - $17.50
Lightly Played Foil - $15.70
Moderately Played Foil - $14.00
Heavily Played Foil - $12.30
Damaged Foil - $8.80
NM-Mint Foil Non English - $17.50
Lightly Played Foil Non English - $15.70
Moderately Played Foil Non English - $14.00
Heavily Played Foil Non English - $12.30
Damaged Foil Non English - $8.80