Morophon the Boundless

“Changeling <em>(This card is every creature type.)</em> <br> As Morophon, the Boundless enters the battlefield, choose a creature type. <br> Spells you cast of the chosen type cost WUBRG less to cast. This effect reduces only the amount of colored mana you pay. <br> Other creatures you control of the chosen type get +1/+1.”