***TRIALS RESPONSE***It's an interesting concept, but I've found that the Nightmare + Silence combo is actually kind of counter-intuitive. Yes, you do get to deny draws and force discards, but that's not really going to get you anywhere because the cards will eventually get played. I've experimented with a Phase Recluse + Silence + Nightmare deck in the past, and the main problem that I saw there was the lack of damage before my denial ran out -- I suspect that your deck might run into the same problem.
Because the deck is trying to do more than one thing at once, it interferes with the mindset of Pestal. Ideally, you want to set up fast Pests and Fractals for a lockdown, followed by Vampires to ensure that you outheal any damage your opponent has gotten played before the initial lockdown. (Note that the Vampire Fractal aspect is what lets you win games if the initial lockdown strategy fails) Having only 5 Pests and 3 Fractals isn't going to cut it, even with the added early denial. The lack of quanta sources is also going to hurt you in the long run. Even though you've included more early denial to make up for that, Nightmare and Silence still cost quanta to play and reduce your chances of an early lockdown. A standard Pestal usually plays with at least 13 Pends to ensure a fast initial Fractal of Pests.
Here's a Nightmare Pestal variation that you can try out. I've removed the Silences, as you want to make sure that you have enough
quanta to cast Fractal as early as possible. 6 Pests and 2 Vampires for better combo control (I would have liked a third Vampire to reduce the chance of not drawing enough damage post-lockdown), and some extra quanta to get the combo going faster. This deck goes with only 12 Darkness Pends, but
quanta is a bit more expendable due to Pests, and Nightmare does help slow down the opponent's early game if you play it after they play out their initial pillars and early-game cards.
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