Lunala GX (SM17) [Sun & Moon: Black Star Promos] 248 when an attack is declared

when an attack is declared involving a monster you control and an opponent's monster: You can target that monster you control

Set: Storm of Ragnarok Card type: Effect Monster Rarity: Common Attack: 1500 Defense: 1500 If you control a face-up "Legendary Six Samurai - Mizuho"

Set: Ancient Sanctuary Card type: Normal Monster Rarity: Common Attack: 1600 Defense: 1600 A wandering warrior who seeks the sanctuary where he can gain the power of the Archlords

Set: XY: Generations Type: Fairy Rarity: Ultra Rare Retreat cost: Colorless

You can only use this effect of "Block Dragon" once per turn

Lunala GX (SM17) [Sun & Moon: Black Star Promos] 248 when an attack is declaredSet: Sun & Moon: Black Star Promos Type: Psychic Rarity: Promo Retreat cost: Colorless,Colorless