OCG Rulings[]
- This card can be activated during a turn in which either player has performed a Synchro Summon or an Xyz Summon. Neither player can Synchro Summon or Xyz Summon after this card resolves.[1]
- This card cannot be activated during the Damage Step.[1]
References[]
- ↑ 1.0 1.1 Konami OCG Card Database: Grisaille Prison