Darksteel Monarch

Affinity for artifacts (this spell costs {1} less to cast for each other artifact you control)

Vigilance

All other non token artifacts you control becomes 0/0 Myr artifact creature with "this creature gets +1 +1 for each other artifact creature you control"

Whenever you cast an artifact spell create a 0/0 Myr artifact creature token with "this creature gets +1 +1 for each other artifact creature you control"