The only things Baylen cant do on their own is removal, recursion, and protection, so pack a couple of mass-blink spells like Eerie Interlude to save yourself in the event of a board wipe and a Raise the Past for when someone counters it
Ultimately, you need to factor in more than just whats popular when it comes to deck building, and the best way to figure that out is to build a deck and play some games without thinking too much about it
Most importantly, giving your demon deck that would otherwise just be heavy on black access to blue is bound to be useful, giving it access to stronger draw spells and counterspells
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On this page, were discussing Palkia ex specifically, who threatens to make already frustrating decks to battle against Misty and Articuno decks even more of a nuisance