Naugrim Shard-Carver

Whenever you draw a card, you may pay {2}. If you do, create a treasure token. (It's an artifact with "{t}, Sacrifice this artifact: Add
one mana of any color.")
"Dwarves love all things born under-earth. The precious ores are sacred to them. But that which they seek most dearly, and covet above all else,
are the gems hidden deep within."