This card can attack directly. You can only use each of the following effects of Wattuna once per turn. At the end of the Damage Step, if your monster inflicts battle damage to your opponent: You can Special Summon this card from your hand. When this card inflicts battle damage to your opponent by a direct attack: You can Tribute this card on the field and 1 or more non-Tuner monsters from your hand and or face-up field, and Special Summon 1 Watt Synchro Monster from your Extra Deck whose Level equals the total Levels of those Tributed monsters.