Mathura art is usually contasted with art that is the artistic manifestation of Greco-Buddhism, and is a cultural syncretism between buddhism and what?
Mathura art:  The art of Mathura is usually contrasted with the Greco-Buddhist art of Gandhara. Greco-Buddhist art: Greco-Buddhist art is the artistic manifestation of Greco-Buddhism, a cultural syncretism between the Classical Greek culture and Buddhism, which developed over a period of close to 1000 years in Central Asia, between the conquests of Alexander the Great in the 4th century BC, and the Islamic conquests of the 7th century AD.
Classical Greek culture