 On 19 November 1714, he was promoted metropolitan archbishop of Archdiocese of Kalocsa and held the Nagyvárad diocese as apostolic administrator until his death.Csáky was created cardinal priest "in pectore" in the consistory of 12 July 1717 by Pope Clement XI with the title of Sant'Eusebio.He took part in the Papal conclave of 1721, but not in those of 1724 and 1730.