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However, Ruby has a lot more powerful cards to leverage and I doubt this one will make the cut

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That said, I do see this being a hard sell during a Rule-0 discussion when plenty of players get frustrated by the actual Rhystic Study

For starters, having to discard an energy from hand could work with decks like Ceruledge ex that benefit from having energy in the discard

Example: Diseased Vermin reads, in part, "At the beginning of your upkeep, Diseased Vermin deals X damage to target opponent previously dealt damage by it, where X is the number of infection counters on it." If Diseased Vermin phases out, it "remembers" how many counters it has and also which opponents it has previously damaged