Creature and planeswalker spells you cast have affinity for artifacts.
[+2]: Tezzeret, Master of the Bridge deals X damage to each opponent, where X is the number of artifacts you control. You gain X life.
[-3]: Return target artifact card from your graveyard to your hand.
[-8]: Exile the top ten cards of your library. Put all artifact cards from among them onto the battlefield.

NOTE: Stock image, not actual card.