Thunder Dragonduo (SOFU-EN022) - Soul Fusion Unlimited

Cannot be Normal Summoned/Set. Must first be Special Summoned (from your hand) by banishing 1 LIGHT and 1 DARK monster from your GY. Once per turn, when a monster effect is activated in the hand: This card gains 300 ATK until the end of this turn. When this card destroys an opponent's monster by battle, you can banish 1 card from your GY: Add 1 Thunder monster from your Deck to your hand. Once per turn, during your opponent's End Phase: You can target 1 of your banished cards; place that target on either the top or bottom of your Deck.