"Suijin" + "Sanga of the Thunder" Must be Special Summoned (from your Extra Deck) by banishing the above cards you control. Once per Chain (Quick Effect): You can target 1 face-up monster your opponent controls; change its ATK to 0 until the end of this turn. You can only use this effect of "Gate Guardian of Water and Thunder" twice per turn. If this face-up Special Summoned card in its owner's control leaves the field because of an opponent's card: You can Special Summon 1 of your banished "Suijin" or "Sanga of the Thunder".