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You can also get this mana from artifacts that used to generate generic mana and got erratad like Plague Myr

That said, Ketramose could be too slow for Modern, and cannot be tutored by Recruiter of the Guard, so its viability is certainly dubious

The goal is generally to enable peer-to-peer trading among players

Griselbrand goes in the same flow drawing all cards in your library costing 1 life each, since it can be reanimated, it can come in a cheaper cost in respect to mana value

Bad Moon is a super-basic effect, but you have alternative options like Ascendant Evincar, or any of the black-adjacent Liege creatures like Ashenmoor Liege