You can Special Summon this card (from your hand) by Tributing 1 "Helios - The Primordial Sun". This card's ATK/DEF become the number of banished monsters x 200. 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 300 ATK/DEF.
![Helios Duo Megistus [SGX3-ENI22] Common](http://www.cardmerchanttakapuna.co.nz/cdn/shop/files/17f2e8b3-5112-586d-ad8c-629df8dca993_c9b5339f-dbfd-4fbf-8abc-9827cf4878a2.jpg?v=1723241306&width=1445)