Like most Pokmon cards, the value of Nincada depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Roaring Skies)
Tuvasa finally provided a genuine home for all the classic enchantress players
Where it gets rather out of hand is the back end
What Id Look For: Favourite black cards, value cards, cards that can be flexible
Leyline and Hallowed could be swapped out if you dont like the slower strategies they focus on (though giving everything flying is shockingly good), but never take out Sunrise and Authority
Most recently, God Packs were confirmed in both Shiny Treasures ex and its upcoming Western counterpart, Paldean Fates