Korr, Infernal Breeder

When Korr, Infernal Breeder enters the
battlefield, create a 1/1 colorless Construct
artifact creature token.

{t}, Sacrifice an artifact: Choose one —
• Add {c} to your mana pool.
• Exile the top card of your library. Until
the end of your turn, you may play that card.

Unearth {c}{b}{r}