Riryoku - SD09-EN021 - Common - 1st Edition Tweet Out of stock. Wishlist Details Attribute: Spell Card Number: SD09-EN021 Card Rules: Rulings powered by The Netrep API. This card halves the current ATK of the monster it targets. If this card targets a monster that is affected by 'Shrink', its ATK will become half of the halved ATK, or 1/4 its original ATK. If a monster whose ATK is halved by 'Riryoku' is affected by 'Shrink', its ATK will become half of its original (printed) ATK. [Re: Big Shield Gardna] A face-down 'Big Shield Gardna' can only negate a Spell Card that targets 1 face-down monster, so it cannot negate 'Riryoku', 'Creature Swap' or 'Dark Hole', but could negate 'Nobleman of Crossout' or 'Tribute to the Doomed'. [Re: Spirit Reaper] If 'Spirit Reaper' is targeted by 'Riryoku', it is destroyed, but the increase to the other monster's ATK lasts until the end of the turn as normal. Card Text: Halve the ATK of 1 face-up monster and add the same amount to the ATK of another face-up monster, until the end of this turn. Card Type: Normal Spell Edition: 1st Name: Riryoku Passcode: 34016756 Rarity: Common Set: Structure Deck