Mount Doom

An untapped BR land can support a one-of, but repeated life payments and legendary status make it weaker than fetch-shock mana; its abilities are minor.

Could be wrong if A strong BR shell that values a low-cost utility land could make one copy more common.

It supplies both colors untapped, but Legacy mana bases favor fetchable duals and utility lands; paying life per activation is a substantial drawback.

Could be wrong if A black-red deck with unusually spare land slots could value the hard-to-counter land abilities.

A usable BR land with a conditional late sweeper, but it is painful, color-restricted, legendary, and needs a legendary artifact to realize its best mode.

Could be wrong if Reliable legendary-artifact support could make the asymmetric wipe worthwhile in more Rakdos lists.

Untapped BR fixing generally makes decks, though every colored use costs life; the seven-mana sweeper is powerful but highly conditional on a legendary artifact.

Could be wrong if Unknown artifact density and format speed determine whether the sacrifice mode is realistic or nearly blank.