Thror, King of Erebor

Whenever a Dwarf you control deals combat
damage to a player, create a colorless Gold
artifact token with "Sacrifice this artifact: Add
one mana of any color to your mana pool."
Metalcraft — Creatures you control get +2/+1
as long as you control three or more artifacts.
Thror, king under the mountain. The mightiest of the
dwarf lords. Thror ruled with utter surety, and all
would pay homage to him.