Prof. Oak's Research (98/112) [EX: FireRed & LeafGreen] Psychic [x2] You can only use this

You can only use this effect of "Protector with Eyes of Blue" once per turn

Set: Starter Deck: Dark Legion Card type: Counter Trap Rarity: Common When an opponent's monster declares an attack: Target the attacking monster

destroy all face-up "Crystal Beast" cards you control

during damage calculation: Your battling monster's ATK and DEF each become double its current ATK and DEF during that damage calculation only

Set: Hidden Summoners Card type: Continuous Trap Rarity: Super Rare During the Main Phase: You can activate this effect

Prof. Oak's Research (98/112) [EX: FireRed & LeafGreen] Psychic [x2] You can only use thisSet: EX: FireRed & LeafGreen Type: Supporter Rarity: Uncommon