Chaos Change Xyz

A chaos change xyz is when you use a xyz monster as the entire xyz material for a monster.
For example when you use Utopia for C39 Utopia.\
The new monster ge6ts to keep the matierials of the old one.

This can be useful when your using cards that can take conrol of your opponent's monsters, like mind control.
Use mind control on say a Tiras, Keeper of Genisis, then as it is a Rank 5 you can chaos change into a Gaia Dragoon the Thunder Charger.
This means your opponent doesn't get Tiras back and you have a 2600 beater with peircing.
Works with Utopia too, only you get a 2500 beater without peircing.

Fun stuff