Mako & Bobo, Dumb Kitties

Changeling (This card is every creature type.)
As Mako & Bobo, Dumb Kitties enter 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.