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 - £14.30
Lightly Played - £12.10
Moderately Played - £10.00
Heavily Played - £7.20
Damaged - £4.30
Near Mint Non English - £14.30
Lightly Played Non English - £12.10
Moderately Played Non English - £10.00
Heavily Played Non English - £7.20
Damaged Non English - £4.30
Foil Prices
Near Mint Foil - £36.00
Lightly Played Foil - £30.60
Moderately Played Foil - £25.20
Heavily Played Foil - £18.00
Damaged Foil - £10.80
Near Mint Foil Non English - £36.00
Lightly Played Foil Non English - £30.60
Moderately Played Foil Non English - £25.20
Heavily Played Foil Non English - £18.00
Damaged Foil Non English - £10.80