In most cases, the only non-chaos-typed monster that it plays is Sinister Serpent
Perfect Use Scenarios
While its attack, Full Moon Rondo, is situational, its ability, Fairy Zone, may be useful in certain situations
Basic Energy cards are always legal, no matter what set they are from, so we have discontinued listed them in older sets for space consideration
So in a Commander context, I see discard as the best way to describe a swathe of interdependent synergistic mechanics, mostly based in black, which look for advantage by quickly pitching their own hand to the graveyard
And that second copy is granted an extra ability far beyond what it had in its first life