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.