23 cards where the cards aren’t reprints and the mana cost is greater than or equal to {B/R}{B/R}

Spiteful Visions (Shadowmoor #198)
Murderous Redcap (Shadowmoor #192)
Bloodsoaked Insight // Sanguine Morass (Modern Horizons 3 #252)
Bloodsoaked Insight // Sanguine Morass (Modern Horizons 3 #252)
Obosh, the Preypiercer (Ikoria: Lair of Behemoths #228)
Angrath, Captain of Chaos (War of the Spark #227)
Kulrath Knight (Shadowmoor #190)
Ashenmoor Liege (Shadowmoor #181)
Cryptborn Horror (Return to Ravnica #212)
Sonorous Howlbonder (Ikoria: Lair of Behemoths #230)
Din of the Fireherd (Shadowmoor #184)
Fulminator Mage (Shadowmoor #188)
Rakdos Guildmage (Dissension #145)
Bedeck // Bedazzle (Ravnica Allegiance #221)
Rakdos Shred-Freak (Return to Ravnica #221)
Avatar of Discord (Dissension #140)
Carnage Interpreter (Ravnica: Clue Edition #26)
Push // Pull (Murders at Karlov Manor #250)
Elite Headhunter (Throne of Eldraine #209)
Tyrannize (Shadowmoor #201)
Demigod of Revenge (Shadowmoor #183)
Ashenmoor Gouger (Shadowmoor #180)
Poison the Well (Shadowmoor #193)
Sootwalkers (Shadowmoor #196)

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