Ampharos (BW67) [Black & White: Black Star Promos] Lightning[-30] You can only use this

You can only use this effect of “Ride of the Valkyries” once per turn

When a Thunder monster's effect is activated in the hand

Set: The Lost Art Promotion Card type: Effect Monster Rarity: Ultra Rare Attack: 1000 Defense: 1000 If you have "Right Leg of the Forbidden One"

its ATK becomes equal to the current ATK of the monster on the field that has the highest ATK

negate all the effects of face-up effect monsters your opponent controls

Ampharos (BW67) [Black & White: Black Star Promos] Lightning[-30] You can only use thisSet: Black & White: Black Star Promos Type: Lightning Rarity: Black Star Promo Retreat cost: Colorless,Colorless