Step 1. Normal Summon a Photon or Galaxy Monster
Step 2. Special Summon Photon Vanisher using its own effect
Step 3. Using Photon Vanisher's effect, add Galaxy Eyes Photon Dragon to your hand
Step 4. Activate Photon Orbital, Sending itself to the graveyard to add Galaxy Eyes Afterglow Dragon to your hand
Step 5. Special Summon Galaxy Eyes Photon Dragon using Advancer and Vanisher
Step 6. Activate Afterglow Dragon's effect, special summoning itself from the hand
Step 7. XYZ Summon Number 90: Galaxy-Eyes Photon Lord (if Going first) or Number 62: Galaxy-Eyes Prime Photon Dragon (if going second) using both Galaxy Eyes cards

If you summoned Number 62:
Step 8. Enter Battle Phase, and attack a card the opponent controls.
Step 9. Activate Prime Photon's effect, detaching an Afterglow Dragon and increasing Prime Photon's attack by 1600
Step 10. Activate Afterglow's effect, Special Summoning another Galaxy-Eyes Photon Dragon from the deck, and double Prime Photon's attack
Step 11. Attack for a lot of damage