You can Ritual Summon this card with "Rebirth of Nephthys". You can only use each of the following effects of "Cerulean Sacred Phoenix of Nephthys" once per turn.
• During your Main Phase: You can destroy "Nephthys" cards in your hand and/or face-up field, then destroy an equal number of monsters your opponent controls.
• During your next Standby Phase after this card was destroyed by battle or card effect and sent to the GY: You can Special Summon this card from the GY.