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Use dragon Shrine to easily send 2 Blue Eyes White Dragons to your GY. You need 3 Blue Eyes White Dragon in your GY to use Dragon´s Mirror to fusion summon the powerful Blue Eyes alternative ultimate Dragon by banishing the 3 Blue Eyes White Dragon in your GY.
Replace 1x White Stone of Ancients, 1x Blue Eyes Spirit Dragon to add 2 or 3 Dragon´s mirror.
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Tactic: Use Nebula Dragon to easy Summon Rank 8 XYZ. Send other Dragon Monsters from your Deck or Hand to GY. Special Summon Felgrand first from your GY to banish your opponents Cards. Attack their Monsters with Felgrand to special summon more lvl 7/8 Dragons from your GY.
Send Arkbrave Dragon to your GY to special Summon a lvl 7/8 Dragon (mainly Felgrand) from your GY.
Use Galaxy Eyes Photon Dragon only to XYZ summon a Galaxy Eyes XYZ Monster (read the Effect of those to understand).