Door of Destinies 208 (Magic 2014 (M14))

As this artifact enters, choose a creature type. Whenever you cast a spell of the chosen type, put a charge counter on this artifact. Creatures you control of the chosen type get +1/+1 for each charge counter on this artifact.

NM - $9.90
LP - $7.90
MP - $5.90
HP - $4.00
DMG - $2.00