Notes & Combos
If I could I'd add Reptilianne to the archetypes of the deck because they're sometimes the MVP.
This is a go-second deck, hence the 8 board-breakers and 0 hand-traps. The idea is that through Reptilianne Hydra and/or Ogdoabyss you can clear most boards and OTK pretty easily from there.
In an ideal world, you can use Haggard banishing a 0 atk, Lamia and finally Echidna to tutor 3 reptiles, and then pop all 3 monsters and draw 3 with Hydra (which you are guaranteed to summon if Echidna's search went through).
Ammonite is good to add with Echidna because you can go into Zer'oll right after, which adds Recombination Device, which foolish Stealthbuster and places A-Counters. Then you can use Zer'oll effect to extra-norm Ammonite and get into Gol'gar which is an extra pop.
The Raika package is small but handy, Bloom adds a nice ATK boost, Armored Lizard's bounce can help force a negate, and Selene Snapper takes care of the backrow. If you use Odgoabyss to clear the board the Raikas will either come back or stay because you reborned them.
Replays
Against Snake-Eyes: https://youtu.be/uAnzQHP0tpg
Against Yubel Spright: https://youtu.be/HUeZ4mK-NAM
Against Centur-Ion Bystials: https://youtu.be/Aq_qYxyMnyc