A fun deck I made when trying to make a combo using the Starry Knight archetype that incorporated Seiyaryu which is the basis of the Starry Knight archetype. The only way I could find to make use of Seiyaryu was to use the Hieratic monsters. Thankfully, the Hieratics actually do synergize with the Starry Knights because of Starry Knight Astel. Starry Knight Astel can tribute a Hieratic to summon Radiant Seiyaryu from the hand and also a normal dragon from the deck. Seiyaryu can be summoned from the deck to make a level 7 XYZ and Labradorite Dragon can be summoned and synchro'd with Astel for Master Flare Hyperion. The ideal turn 2 combo is:
Hand: Radiant Seiyaryu (searchable), Starry Knight Astel (searchable), Dragon of Su (or Tefnuit), Dragon of Eset (searchable), Holy Knight Sky (4x w/terraforming), Monster Reborn/Silver's Cry (4x).
Normal summon Eset, tribute for Su, pop a S/T, special summon Laboradorite, overlay for Atum, detach Laboradorite, special summon REDMD, REDMD effect to special summon Eset, activate Holy Knight Sky, use effect to normal summon Starry Knight Astel, use Starry Knight Astel's effect to tribute Eset, special summon Radiant Seiyaryu from hand, pop a card, and special summon Seiyaryu from deck, overlay them into Voloferniges, link Atum and REDMD into Hieratic Seal, reborn Laboradorite, and finally Synchro Astel and Laboradorite into Masterflare Hyperion. This board packs 4 interruptions, Voloferniges' quick effect can destroy 1 face-up card, Masterflare Hyperion can banish 1 card on the field, and Hieratic Seal can tribute itself to bounce a card and then special summon Radiant Seiyaryu which can pop a card for a 4th interruption.
I feel like one time I managed to pull this off with a Return of the Dragon Lords but I forgot how I did it lol.
Side deck is just some alternate options I considered.
450
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450
