Mewtwo (052) [Scarlet & Violet: Black Star Promos] RC31 you can send this card

you can send this card from your hand to the Graveyard

Once per turn: You can change 1 face-down Defense Position "Subterror" monster you control to face-up Attack or Defense Position

destroy all Defense Position monsters your opponent controls after damage calculation

It cannot change its battle position or declare an attack until the end of your opponent's next turn

This card cannot be Special Summoned except with its own effect or with "Assault Mode Activate"

Mewtwo (052) [Scarlet & Violet: Black Star Promos] RC31 you can send this cardSet: Scarlet & Violet: Black Star Promos Type: Psychic Rarity: Promo Retreat cost: Colorless,Colorless