Altergeist Kunquery [SP18-EN029] Starfoil Rare Extreme Force You can only this effect

You can only this effect of "Gravekeeper's Supernaturalist" once per turn

and you control no other cards

During the End Phase of the turn you activated this card

not just 1

any damage your opponent takes is halved

Altergeist Kunquery [SP18-EN029] Starfoil Rare Extreme Force You can only this effectSet: Star Pack VRAINS Card type: Effect Monster Rarity: Starfoil Rare Attack: 0 Defense: 2400 When an opponent's monster declares an attack, if you control an "Altergeist" card: You can Special Summon this card from your hand, and if you do, negate that attack. If this card is Special Summoned: You can target 1 face up card your opponent controls; negate the effects of that card while it and this monster are face up on the field.