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 - $0.25
Lightly Played - $0.25
Moderately Played - $0.25
Heavily Played - $0.25
Damaged - $0.25
Near Mint Spanish - $0.25
Lightly Played Spanish - $0.25
Moderately Played Spanish - $0.25
Heavily Played Spanish - $0.25
Damaged Spanish - $0.25