Kuriboh - Multiply!

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When your opponent [[activate]]s a [[monster effect]], or an opponent's [[monster]] [[declare]]s an [[attack]] ([[Quick Effect]]): You can [[Special Summon]] this card from your [[hand]]. You can only use this [[effect]] of "Kuriboh - Multiply!" [[once per turn]]. Once per [[turn]], when your opponent activates a monster effect on the [[field]], or during [[damage calculation]], when an opponent's monster [[attack]]s (Quick Effect): You can [[Add a card|add]] to your hand, or Special Summon, 1 "[[Dark Magician]]" or 1 monster with 300 [[ATK]]/200 [[DEF]] from your [[Main Deck|Deck]] or [[GY]], then you can change that opponent's monster's ATK to 0.