You can definitely include a few expensive bombs like Old Gnawbones or Brightsteel Collosus, but flexibility is important, and why not pour all that mana into some big, flashy Fireball effects
As stated on Herald of the Abyss Q&A (Q&A), the monster selected by the opponent is sent to the graveyard even if it is unaffected by Spell, making Herald of the Abyss an effective removal against Expurrely Noir with 5 or more Xyz Materials
This is where Atla Palani shines
Area Zero Underdepths is only active when there is a Tera Pokmon in play
(And there go my millionaire dreams
In fact, considering how many cards are printed today compared to the 1990s, some of the best Pikachu cards from the modern era are a lot cheaper than even normal-people rares from older Pokmon sets