We don't necessarily see a compelling reason to ban Reckoner Bankbuster, but it's definitely a possibility, given it appeared in seven out of the top eight decks in the March of the Machine pro tour
Before we begin, we should clarify that we are specifically examining cards for the 99 of a deck, rather than new options for a deck's commander
A Master Ball Rare: This special card features a Master Ball and has a unique foiling pattern
One Big Problem Ultimately, given its not Commander legal by default, Kharis & The Beholder is unlikely to be Rule-Zeroed in beyond Bracket Three

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its making them pay for all the land they have