For example Chief of the Edge has the ability:
Other Warrior creatures you control get +1/+0.
So I understand that it would definitely affect Avalanche Tusker. But if I play another Chief of the Edge, do they mutually affect each other, giving each other +1/+0 (and my Tusker +2/+0)?
Other examples where "other" is used in this way include Adaptive Automaton and Armament Master.