Forum:Kristya XYZ

Is it possible to use Archlord Kristya as XYZ material? This would be useful for the following combo:

Hyperion and Kristya in hand Special Summon Hyperion(s) using an agent to set up the graveyard Special Summon Kristya XYZ 8-rank monster (usually Heratic Sun Dragon or Neo Galaxy Eyes Photon Dragon)

I'm not sure if this is allowed because it says neither player can special summon.