Metalcraft
Metalcraft is an ability word introduced in Scars of Mirrodin and gives a bonus to a permanent or a spell if its controller also controls three or more artifacts. It is exclusive to the Mirran faction. Metalcraft was featured as rules card 2 of 5 in the Scars of Mirrodin set and as rules card 2 of 5 in the Mirrodin Besieged
Notable Metalcraft cards
Rusted relic this is the only non-artifact creature to have Metalcraft