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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.)
@RubiniaSoulsinger: https://gatherer. Wizards. Com/pages/card/Details. Aspx? Multiverseid=129502
Sharing multiple creature types doesn’t give an additional bonus. Coat of Arms counts creatures, not creature types.