They're just weak, at least on their own
Nemesis continued the themes of Rebels, Mercenaries, and Spellshapers, while also adding a new keyword to the lexicon: fading
The price for each deck as of writing is around 45 dollars, which is a bit more than what you can get most recent EDH precons for
This is already gettable for a quarter, but Im not sure its good enough in Modern Spirits to warrant even being a three-of
Discard does the same thing to opposing decks as crash testing does to a car: subject it to massive additional strain across every area until something fails (and hurts the dummy piloting it)
To work out which cards are most valuable, we're working with TCGPlayer's market value of just the main Streets of New Capenna set itself (meaning none of the Commander-exclusive cards or cards found in preconstructed decks)