Spoiler : In order to make this a difficulty hack, you would have to have the NPC's play cards like a normal human, and I don't have the AI coding skills for that
Berta, Wise Extrapolator Clement, the Worrywort Dreamdew Entrancer Galloping Lizrog Genghis Frog Grolnok, the Omnivore Lilysplash Mentor Octomancer Omnibian Plaxcaster Frogling Pond Prophet Punk Frogs Species Gorger
If a face-down permanent you control leaves the battlefield, or if the game ends or you leave the game while you control it, you must reveal it to all players (even though in this case, everyone saw it before it entered)
Another solution is to split the black into two separate printing plates, so that the text can be applied last, while minimizing the art black obscuring the other colors
Them: Haven't won a match in weeks