Veins of Evil

{t}: Add {c} to your mana pool
You may allow target opponent to put 1 Taint
counter on a permanent on the battlefield. If you
do, {t}: Add {b}, {r}, or {g} to your mana pool.
"Run by demons, worked by slaves, and producing
toxic metals. The mines are machines of pain and
misery. If only there were less of them," - Sorrowful
Beaurocrat