they're perfect for building decks
Given how good the archetype is in the format, Sephiroth was an easy top pick for that reason
Overall, it's a much more versatile batch of cards than this grab-bag of Hatsune Miku planeswalkers - some are good in Commander, but you also have the Modern card Living End, as well Careful Study, which sees a little bit of Legacy and Pauper play
I think every player should take a chance at some point to experience this unique brand of Magic so why not make it now
Assuming you don't misplay this will take their best spell
Say, for example, I had an upcoming Booster Draft tournament using Khans of Tarkir , but I didn't have much time to practice the new set