http://www.yugioh-card.com/en/…ok/YGO_RuleBook_EN-v8.pdf
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ZitatAlles anzeigenXyz Materials
Monsters that are used to Xyz Summon are called “Xyz Materials”, and
are placed underneath the Xyz Monster, to show that they are
attached to it. Monsters that have become Xyz Materials are not
treated as cards on the field. When an Xyz Monster leaves the field,
all of the Xyz Materials attached to it are sent to the Graveyard. If an
Xyz Monster is flipped face-down, or becomes controlled by the
opponent, the Xyz Materials are not sent to the Graveyard. They
remain attached to the Xyz Monster.
Leaves the Field
Some monsters have effects that activate when they “leave the field”.
For example, these effects activate when the monster is sent to the
Graveyard, or is banished, or is returned to the hand or Extra Deck.
When a monster on the field is shuffled into the Main Deck, or becomes
an Xyz Material, it is no longer a card on the field, however its effects
that activate when it “leaves the field” will not activate.
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