Step 1. Activate Mermail Abyssteus, discarding Atlantean Dragoons
Step 2. Activate Abyssteus to add Mermail Abyssgunde and Atlantean Dragoons to add Deep Sea Diva
Step 3. Normal Summon Deep Sea Diva and use its effect to summon Neptabyss, The Atlantean Prince
Step 4. Activate Neptabyss to send Atlantean Dragoons from Deck to GY, then add Atlantean Dragoons from Deck to Hand
Step 5. Activate Atlantean Dragoons in GY to add Mermail Abyssmegalo
Step 6. Use Neptabyss and Abyssteus to summon Knightmare Phoenix, use Phoenix to summon Knightmare Mermaid
Step 7. Use Mermaid to discard Atlantean Dragoons, summon Orcust Knightmare from Deck
Step 8. Activate Dragoons in GY to add Moulinglacia the Elemental Lord
Step 9. Activate Moulinglacia in hand to summon itself and use its effect
Step 10. Use Knightmare Mermaid and Orcust Knightmare to make Galatea, the Orcust Automaton
Step 11. Activate Abyssmegalo in hand, discarding Abyssgunde and any random WATER. Use Gunde to summon Abyssteus from the GY
Step 12. Overlay Abyssmegalo and Abyssteus to summon Mecha Phantom Beast Dracossack. Use Dracossack's effect, detaching anything to summon two Tokens
Step 13. Use Galatea and Dracossack to summon Psy-Framelord Lambda in the Right EMZ
Step 14. Use Deep Sea Diva and a Token to summon Ib the World Chalice Justiciar
Step 15. Use Justiciar Ib to summon World Legacy - World Crown
Step 16. Use Justiciar Ib and a Token to summon Psy-Framelord Omega. Use Justiciar Ib to summon Crowned by the World Chalice
Step 17. Summon World Legacy - World Crown and use Crowned and World Crown to summon Ib the World Chalice Priestess
Step 18. Use Omega's effect and activate Lambda's effect
Step 19. Use Orcust Knightmare in GY to send Gizmek Orochi, The Serpentron Sky Slasher and activate its effect.
Step 20. Use Moulinglacia and Gizmek Orochi to summon Number 97: Draglubion next to Priestess Ib and use its effect to summon Number 38: Hope Harbinger Dragon Titanic Galaxy next to Priestess Ib, attaching any Number Dragon Xyz as material from the ED.
Step 21: End Phase, add Psy-Framegear Gamma from Deck to Hand