Effect
If you control a face-up monster that was Tribute, Ritual, or Fusion Summoned: Until the end of your opponent's next turn, neither player can Synchro or Xyz Summon, Synchro and Xyz Monsters cannot attack, also their effects are negated.
You can activate "Grisaille Prison" even during a turn in which you or your opponent have already performed a Synchro or Xyz Summon. After the effect of "Grisaille Prison" is applied, Synchro and Xyz Summons cannot be performed.
You cannot activate "Grisaille Prison" during the Damage Step.
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