[ Fiend / Xyz / Effect ]2 Level 3 monsters
When a "Djinn" Xyz Monster you control is attacking an opponent's monster, during the Damage Step: You can detach 1 Xyz Material from this card; the attacking monster's ATK is doubled until the End Phase.
You can only use this effect of "Muzurhythm the String Djinn" once per turn.
ATK/ 1500
DEF/ 1000