mtg poison deck commander Atraxa, Praetor's Voice PROLIFERATE COUNTERS Magic Custom each opponent loses 1 life. Poison Dart Frog | Modern

It fixes your mana, but you lose one in the wash, and it is the same with Crystal Grotto

Greater Tanuki is a bit of an extension of that issue, where a 6/5 trample is fine to cast but discarding it to three mana Rampant Growth isn't really a good thing

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Rather than list every single Vintage deck ever, heres an example of the kind of stuff Demonic Tutor and the rest of the busted tutors do (of which, Demonic is clearly the best)

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