Thunder Dragonmatrix (SOFU-EN018) - Soul Fusion Unlimited

You can discard this card, then target 1 Thunder monster you control (Quick Effect); that target gains 500 ATK. If this card is banished, or sent from the field to the GY: You can add 1 “Thunder Dragonmatrix” from your Deck to your hand. You can only use 1 “Thunder Dragonmatrix” effect per turn, and only once that turn.