As a general rule, the majority of fake cards are: Valuable
Black magic exists in an interesting place in Kamigawa: Neon Dynasty , as it seems to primarily want to cooperate with blue for ninjutsu, but any good Magic set also needs its colors to stand independently
Blasphemous Edict Paying 5 mana in black to cast Blasphemous Edict and destroy all creatures is very strong, to the point of seeing Constructed play in many formats
But is that true
As Timothy Zaccagnino said when I asked for his opinion about this topic, I think the onus is partly on the player to say to themselves that they don't need everything that comes out, and I find it interesting and exciting that people can play cards against me in 2023 that I'd never seen before
In your deck design, think, What could totally disrupt my plan? and maybe have some sort of answer available to at least possibly draw