Project Zero Mortals, Reaching Fruition

[Permanent] If your opponent is the original owner of 4 or more Battle Cards in play, reduce the energy cost of this card in your Z-Deck by GGGG. [Activate:Main] If there are no Battle Cards other than "Zamasu" cards in play in all Battle Areas, and you remove this card from the game : Your "Zamasu & SS Rosé Goku Black, Humanity's Destruction" gains the following skill until the start of your turn: "[Auto] Players without a "God" card in play discard all cards in their hands at the end of your opponent's turn."