Morophon, the Boundless (Double Rainbow Foil) [Secret Lair Drop Series]

Changeling (This card is every creature type.)
As Morophon enters, choose a creature type.
Spells of the chosen type you cast cost {W}{U}{B}{R}{G} less to cast. This effect only reduces the amount of colored mana you pay.
Other creatures you control of the chosen type get +1/+1.