Step 1. Normal Summon Cyber Dragon Core, and use its effect to add Cyber Revsystem to your hand
Step 2. Using Galaxy Soldier's effect, Discard Cyber Dragon Herz, and Special Summon Galaxy Soldier from your hand
Step 3.
Chain Link 1. Add Galaxy Soldier to your hand using the Galaxy Soldier on the field's effect
Chain Link 2. Using Herz effect, Add a Cyber Dragon from the deck to the hand
Step 4. Special Summon the other Galaxy Soldier by discarding Cyber Dragon
Step 5. Activate Cyber Revsystem, Special Summoning a Cyber Dragon from the graveyard
Step 6. Link Summon Cyber Dragon Sieger using Core and the Cyber Dragon
Step 7. XYZ Summon Cyber Dragon Nova
Step 8. Activte Cyber Dragon Nova's effect, detaching an XYZ material and Summoning a Cyber Dragon from the Graveyard
Step 9. XYZ Summon Cyber Dragon Infinity over Cyber Dragon Nova
Step 10. Contact Fusion Summon Cymeratech Fortress Dragon Using Sieger and Cyber Dragon
Step 11. Banish Core, Galaxy Soldier, and Herz to Special Summon Chaos Dragon Levianeer
Step 12. Using Levianeer's effect, Special Summon Sieger from the graveyard so that he has an extra monster zone open to the left
Step 13. XYZ Summon a Rank 8 Monster using Levianeer and Fortress Dragon