Step 1. Use one of your starters so as to get two monsters on the field
Step 2. Link Summon Knightmare Pheonix or Knightmare Cerberus using the two starters(note: If you used Formud Skipper, you can skip this step)
Step 3. Link Summon Knightmare Mermaid using the Knightmare that was summoned
Step 4. Using Knightmare Mermaid's effect, discard 1 card to special summon Orcust Knightmare
Step 5. Link Summon Galatea, The Orcust Automaton using Orcust Knightmare and Knightmare Mermaid
Step 6. Using Orcust Knightmare’s effect, Send Orcust Harp Horror to graveyard
Step 7. Using its own effect, banish Harp Horror to Special Summon Cymbal Skeleton from your deck
Step 8. Link Summon Longirsu, The Orcust Orchestrator Using Galatea, The Orcust Automaton and Orcust Cymbal Skeleton
Step 9. Banish Cymbal Skeleton in graveyard to special summon Galatea again from grave
Step 10. Activate Galatea's effect, Shuffling Cymbal Skeleton into the deck and adding an Orcust Spell or Trap card to your hand (Usually Crescendo or Babel)
Step 11. Using Dingirsu, The Orcust of Evening Star’s summon effect, XYZ summon it with Galatea
Step 12. Using Dingirsu, The Orcust of Evening Star's other effect, Attach your banished Harp Horror to Dingirsu
Step 13. Link Summon Topologic Bomber Dragon using Dingirsu and Longirsu
During your opponent's turn (if you have Babel)
Step 14. Using Harp Horror's effect, Special Summon Cymbal Skeleton from the deck to a zone Bomber Dragon Points to. This destroys all the monsters on the field, including Cymbal Skeleton
Step 15. Using Cymbal Skeleton's effect, special Summon Longirsu from the graveyard to a zone Bomber Dragon Points to, destroying all monsters on the field, not including Longirsu