That does mean these strong cards are fair game: Most of the cards that were released with Mythical Archives are powerful and iconic, but they weren't exactly pushing the limits of what the format could take
There are formats that are perfect for both competitive and casual players
Wight of Precinct Six
This list is my most recent attempt and it felt by far and away the best version despite not really having any specific theme
Making black relevant, barring just jamming all of its most powerful cards, has proven incredibly difficult in Cubes of all shapes and sizes

Ashad, the Lone Cyberman Ashling, the Limitless Astrid Peth Bag of Devouring Baloth Prime Biotech Specialist Blood Aspirant Blood Hypnotist Bloodbriar Body Dropper Burdened Aerialist Camellia, the Seedmiser Captain Lannery Storm Captain Lannery Storm Crime Novelist Desert Warfare Dina, Essence Brewer Dragon Appeasement Effluence Devourer Eloise, Nephalia Sleuth Esoteric Duplicator Evendo Brushrazer Experimental Confectioner Fleeting Memories Fleshtaker Forge Boss Furnace Celebration Giant Fly Gixian Infiltrator Gleaming Geardrake Gluttonous Guest Graf Mole Havoc Jester Hearthhull, the Worldseed Jenny Flint Juri, Master of the Revue Kels, Fight Fixer Kingpin, Wilson Fisk Korvold, Fae-Cursed King Lazav, Wearer of Faces Lightless Evangel Lonis, Genetics Expert Magnetic Snuffler Martha Jones Moonstone Eulogist Narci, Fable Singer Nuka-Cola Vending Machine Persuasive Interrogators Piper Wright, Publick Reporter Pirate Peddlers Popular Egotist Prowling Geistcatcher Rakdos, the Muscle Rapacious Guest Ravenous Squirrel Riveteers Ascendancy Rose, Cutthroat Raider Ruthless Deathfang Sandbender Scavengers Sanguine Brushstroke Sanguine Statuette Savra, Queen of the Golgari Scavenger's Talent Scouring Swarm Senator Peacock Sierra, Nuka's Biggest Fan Skittering Precursor Slaughter-Priest of Mogis Slayer's Bounty Smothering Abomination Sorcerer's Broom Szarel, Genesis Shepherd
