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."
Near Mint - £15.30
Lightly Played - £13.00
Moderately Played - £10.70
Heavily Played - £7.70
Damaged - £4.60
Near Mint Non English - £15.30
Lightly Played Non English - £13.00
Moderately Played Non English - £10.70
Heavily Played Non English - £7.70
Damaged Non English - £4.60