Riryoku (SDD)

Riryoku

Card type	Magic
Number	0769
Internal number	1181
Password	34016756
During your turn, you can reduce the ATK of 1 monster by half and add that amount to the ATK of another monster on the field.

#0768: Fairy Dragon

#0770: Riryoku Field

Yu-Gi-Oh! Worldwide Edition: Stairway to the Destined Duel cards (list · gallery)

Sets

Set	Rarity
Purple Millennium Puzzle pack	Ultimate Rare
Green Eye of Wdjat pack	Common
Yellow Eye of Wdjat pack	Common

"Riryoku" can also be obtained through sets containing a glitch card.