Step 1. Using its effect, Special Summon Galaxy Soldier, and Discard Cyber Dragon Herz
Step 2.
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 3. Special Summon the other Galaxy Soldier by discarding Cyber Dragon
Step 4. Overlay both Galaxy Soldiers for Cyber Dragon Nova
Step 5. Using Cyber Dragon Nova's effect, Detach an XYZ material and Special Summon a Cyber Dragon from the graveyard
Step 6. Overlay for Infinity