Duendes Miners

Whenever Duendes Miners enters the battlefield, it Mines.(Create a colorless Gold artifact token with "Sacrifice this artifact: Add one mana of any color.")
"Here, we see the Duendes, doing what they do best, scavenging for supplies for there next mining trip. These little guys, and gals, go from house to house picking up lost items to use for their next expedition" -Sir David Attenborough