You can Special Summon this card (from your hand) by Tributing 1 "Helios Duo Megistus". This card's ATK/DEF become the number of banished monsters x 300. After this card attacks, if your opponent controls a monster, this card can make a second attack in a row. During the End Phase, if this card is in the GY because it was destroyed by battle and sent there this turn: You can Special Summon this card, and it gains 500 ATK/DEF.