42 cards where the cards aren’t reprints and the mana cost is greater than or equal to {4}{U}{B}

The Ur-Dragon (Commander 2017 #48)
Tezzeret, Master of the Bridge (War of the Spark #275)
Sire of Stagnation (Battle for Zendikar #206)
Silumgar, the Drifting Death (Fate Reforged #157)
Nicol Bolas, God-Pharaoh (Hour of Devastation #140)
Callidus Assassin (Warhammer 40,000 Commander #109)
Sauron, Lord of the Rings (Tales of Middle-earth Commander #4)
Lord Xander, the Collector (Streets of New Capenna #197)
Xanathar, Guild Kingpin (Adventures in the Forgotten Realms #239)
Dragonlord Silumgar (Dragons of Tarkir #220)
Nicol Bolas, Planeswalker (Conflux #120)
Magister Sphinx (Conflux #116)
Mindleech Mass (Ravnica: City of Guilds #215)
Primeval Spawn (Dominaria United Commander #13)
Thraximundar (Alara Reborn #113)
Vela the Night-Clad (Planechase 2012 #107)
Great Intelligence's Plan (Doctor Who #133)
Ashiok, Sculptor of Fears (Theros Beyond Death #274)
Nicol Bolas, the Deceiver (Hour of Devastation #205)
Enigma Sphinx (Alara Reborn #106)
Lochmere Serpent (Throne of Eldraine #195)
Damia, Sage of Stone (Commander 2011 #191)
Prince of Thralls (Shards of Alara #182)
Sphinx of the Steel Wind (Alara Reborn #110)
Ruthless Deathfang (Dragons of Tarkir #229)
Blood Tyrant (Conflux #99)
Chromium, the Mutable (Core Set 2019 #214)
Tezzeret, Master of Metal (Aether Revolt #190)
Jhessian Zombies (Alara Reborn #22)
Dinrova Horror (Gatecrash #155)
Shattered Seraph (Streets of New Capenna #221)
Sphinx Sovereign (Shards of Alara #196)
Psychic Symbiont (Core Set 2019 #221)
Memory Vampire (Ravnica: Clue Edition #38)
Vampire Charmseeker (Battlebond #78)
Garza Zol, Plague Queen (Coldsnap #129)
Twisted Justice (Ravnica: City of Guilds #237)
Sivitri Scarzam (Legends #258)
Riven Turnbull (Legends #254)
Fungal Shambler (Apocalypse #100)
A-Shattered Seraph (Streets of New Capenna #A-221)
Who // What // When // Where // Why (Unhinged #120)

The arc of my blade has carved a path of light to the end of these results.