13 cards where the cards aren’t reprints and the mana cost is greater than or equal to {7}{B}{B}

In Garruk's Wake (Magic 2015 #100)
Rise of the Dark Realms (Magic 2014 #111)
Blood for the Blood God! (Warhammer 40,000 Commander #108)
Shadow of Mortality (Streets of New Capenna #94)
Plague Wind (Prophecy #74)
The Cauldron of Eternity (Throne of Eldraine #82)
Skull Storm (Commander 2018 #18)
Dread Cacodemon (Commander 2011 #79)
Bringer of the Black Dawn (Fifth Dawn #43)
Hypnox (Torment #64)
Necropolis Fiend (Khans of Tarkir #82)
Iname as One (Saviors of Kamigawa #151)
Infernal Spawn of Infernal Spawn of Evil (Unhinged #57)

Though this query has ended, its relics still slumber in New Argive.