Overseer of Irbitov

Flying, Extort (Whenever you cast a spell, you may pay {w/b}. If you do, each opponent loses 1 life and you gain that much life.)
Whenever a creature you control extorts, create a gold artifact with, "{t}, Sacrifice this artifact: Add one mana of any color to your mana pool."
Due to possible grave robbers and irresponsible necromancers, Irbitov is guarded by some of Orzhov's angels.