Morophon, the Boundless

Changeling (This card is every creature type.)

As Morophon, the Boundless enters the battlefield,
choose a creature type.

Spells of the chosen type you cast cost {w}{u}{b}{r}{g} less to cast. This effect reduces only the
amount of colored mana you pay.

Other creatures you control of the chosen type get
+1/+1.