Can I use level/rank changing effects on Xyz monsters?
An Xyz Monster's Rank is not its Level; Xyz Monsters do not have a Level. Consequently, Xyz Monsters cannot be used for Synchro, Ritual, or Xyz Summons (unless specifically permitted); and any effects that would refer to the Level of a monster, such as those of "Gravity Bind", "Level Limit - Area B" and "Burden of the Mighty", cannot be applied to an Xyz Monster. Since Xyz Monsters do not have Levels, cards such as "Star Changer", "Scanner" and "Give and Take" cannot be used on them at all. Cards that modify Levels such as "Harmonic Waves", "Feedback Warrior", "Synchro Boost" and "Demotion" also cannot be used on Xyz Monsters.