mtg poison deck commander Atraxa, Praetor's Voice PROLIFERATE COUNTERS Magic Custom each opponent loses 1 life. The 8 Best Poison Commanders

(Check #2 below for an example, and even #6 for another)

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)

Now, this 3/3 first striker for three provides you with a Fiend HunterFiend Hunter in its first chapter (exile another target creature while its on the battlefield)

If you can attach a photo to a text message, you can use Snapshot

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