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"Riryoku" has two targeting aspects.
"Riryoku" will resolve without effect if either of its targets is "Gradius's Option."
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.