Kaguya, the Boundless

Changeling (This card is every creature type.)
As Kaguya, the Boundless enters the battlefield,
choose a creature type.
Spells of the chosen type you cast cost {w}{b}{u}{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.