Special Summon "Photon Thrasher" (to have a "Photon" monster on the field and meet the condition to Normal Summon this card) and activate "Trade-In", discarding "Galaxy-Eyes Photon Dragon" as cost (assuming that it is not already on the Graveyard). Normal Summon this card, Special Summon "Galaxy-Eyes Photon Dragon" and perform an Xyz Summon.
If you don't have Photon DRagon in your hand. Use "Foolish Burial" instead.
You can activate "Photon Sanctuary" to generate 2 Photon Tokens, and be able to Summon this card without Tribute.
You can easily Summon "Number 9: Dyson Sphere" in 1 turn by using this card; activate "One for One" and discard "Galaxy-Eyes Photon Dragon" to Special Summon "Photon Satellite", then Normal Summon this card and Special Summon "Galaxy-Eyes" from the Graveyard. Finally activate the effect of "Satellite" making it and "Galaxy-Eyes" both level 9 and Xyz Summon "Dyson Sphere".