54 cards where the colors is B and the set is “m20”

Agonizing Syphon (Core Set 2020 #83)
Audacious Thief (Core Set 2020 #84)
Barony Vampire (Core Set 2020 #85)
Bartizan Bats (Core Set 2020 #319)
Bladebrand (Core Set 2020 #86)
Blightbeetle (Core Set 2020 #87)
Blood Burglar (Core Set 2020 #88)
Blood for Bones (Core Set 2020 #89)
Bloodsoaked Altar (Core Set 2020 #90)
Bloodthirsty Aerialist (Core Set 2020 #91)
Bogstomper (Core Set 2020 #320)
Boneclad Necromancer (Core Set 2020 #93)
Bone Splinters (Core Set 2020 #92)
Cavalier of Night (Core Set 2020 #94)
Dark Remedy (Core Set 2020 #321)
Disentomb (Core Set 2020 #322)
Disfigure (Core Set 2020 #95)
Dread Presence (Core Set 2020 #96)
Duress (Core Set 2020 #97)
Embodiment of Agonies (Core Set 2020 #98)
Epicure of Blood (Core Set 2020 #99)
Fathom Fleet Cutthroat (Core Set 2020 #100)
Feral Abomination (Core Set 2020 #101)
Gorging Vulture (Core Set 2020 #102)
Gravedigger (Core Set 2020 #103)
Gravewaker (Core Set 2020 #323)
Gruesome Scourger (Core Set 2020 #104)
Knight of the Ebon Legion (Core Set 2020 #105)
Legion's End (Core Set 2020 #106)
Leyline of the Void (Core Set 2020 #107)
Mind Rot (Core Set 2020 #108)
Murder (Core Set 2020 #109)
Noxious Grasp (Core Set 2020 #110)
Rotting Regisaur (Core Set 2020 #111)
Sanitarium Skeleton (Core Set 2020 #112)
Savage Gorger (Core Set 2020 #291)
Scheming Symmetry (Core Set 2020 #113)
Skeleton Archer (Core Set 2020 #324)
Sorcerer of the Fang (Core Set 2020 #114)
Sorin, Imperious Bloodlord (Core Set 2020 #115)
Sorin's Guide (Core Set 2020 #292)
Sorin's Thirst (Core Set 2020 #325)
Sorin, Vampire Lord (Core Set 2020 #290)
Soul Salvage (Core Set 2020 #116)
Thirsting Bloodlord (Core Set 2020 #293)
Thought Distortion (Core Set 2020 #117)
Undead Servant (Core Set 2020 #118)
Unholy Indenture (Core Set 2020 #119)
Vampire of the Dire Moon (Core Set 2020 #120)
Vampire Opportunist (Core Set 2020 #326)
Vengeful Warchief (Core Set 2020 #121)
Vilis, Broker of Blood (Core Set 2020 #122)
Walking Corpse (Core Set 2020 #327)
Yarok's Fenlurker (Core Set 2020 #123)

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