Duergar Yak-Tender

Splice onto artifact {r} (As you cast an artifact spell, you may reveal this card from your hand and
pay its splice cost. If you do, add this card's text to that spell.)
When this permanent enters the battlefield, until end of turn, it gains "{r}, Sacrifice this permanent: Add {r}{r} to your mana pool. Draw
a card, then discard a card."
They left the mines in search of greatness.