mtg fireball cards among any number of target creatures and/or players. Delayed Blast Fireball | Commander

Many cards have powerful Void abilities, which makes blocking quite hard in this format

Falkenrath Gorger gives any vampire card the madness text, while Conspiracy Theorist, Containment Construct and Oskar, Rubbish Reclaimer work for any card (though Theorist and Construct do not let you break timing rules the way true madness does)

There's nothing wrong with playing staples and aiming for a higher power level, but there's also nothing wrong with getting cute with your synergy and having what might be a lower powered deck

This is the first card on the list that I could realistically see ending up banned, though it has a lot of things pushing against it

That 29,000 number jumps to over 86,000 when you count every different printing, including alternate art versions, extended art treatments, and showcase frames