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Below is the basic combo to DPE with just a Serziel in hand:
- normal summon Serziel -> search Basilius (either search it directly or add Pareidolia to search for Basilius) -> special summon Basilius -> use its effect to send Selene to the GY -> make Verte -> DPE
With this combo, you have a DPE on board that can pop the field spell to add Serziel to search another card next turn and potentially OTK with Gorgoneio.
If you open up a Serziel and a familiar, then you can have a much more threatening endboard:
- normal summon Serziel -> search the familiar you're missing or add Pareidolia to search for the familiar you're missing -> special summon Basilius -> use its effect to send Gorgoneio to the GY -> use Gorgoneio's GY effect to send the Catoblepas from hand to GY and add Selene (or any of the other Evil Eye cards if you already have access to Selene) -> special Catoblepas from the GY and use effect to protect the Selene on-field -> go into a rank 3 XYZ or Verte
The extra deck is very flexible but I'd recommend at minimum the DPE + Verte, Gossip Shadow (2x), Gorgon ( >= 1x), and Zerrziel (1x). I do recommend Octobypass for situations where you need to direct attack and end the gameHandtraps can be swapped around for the meta as needed. Feel free to experiment with floodgates (Summon Limit, Kaiser Colosseum, Gozen Match may work for you), and don't forget you can turn them off for yourself with Serziel's "cost", DPE, or "Forbidden Droplets".