Boundless Hunger

Changeling (This card is every creature type.)
As Boundless Hunger 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.

"The creation of life must be followed by the needs of the living. The universe is no exception."—Thanatos