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
Near Mint - $16,000
Lightly Played - $12,800
Moderately Played - $11,200
Heavily Played - $9,600
Damaged - $8,000
Near Mint Spanish - $16,000
Lightly Played Spanish - $12,800
Moderately Played Spanish - $11,200
Heavily Played Spanish - $9,600
Damaged Spanish - $8,000
Foil Prices
Near Mint Foil - $33,400
Lightly Played Foil - $26,700
Moderately Played Foil - $23,400
Heavily Played Foil - $20,000
Damaged Foil - $16,700
Near Mint Foil Spanish - $33,400
Lightly Played Foil Spanish - $26,700
Moderately Played Foil Spanish - $23,400
Heavily Played Foil Spanish - $20,000
Damaged Foil Spanish - $16,700