Sea Monster of Theseus [MP17-EN231] Secret Rare Astral Pack 4 At least 1: While this

At least 1: While this card is face-up on the field

While this card is on the field

Set: Gladiator's Assault Card type: Fusion/Effect Monster Rarity: Ultimate Rare Attack: 2100 Defense: 1200 "Elemental Hero Avian" + "Elemental Hero Burstinatrix" This monster cannot be Special Summoned except with ""Dark Fusion""

Set: The Dark Illusion Card type: Toon/Effect Monster Rarity: Super Rare Attack: 2500 Defense: 2100 Cannot attack the turn it is Summoned

Sea Monster of Theseus [MP17-EN231] Secret Rare Astral Pack 4 At least 1: While thisSet: 2017 Mega Tins Mega Pack Card type: Fusion Tuner Monster Rarity: Secret Rare Attack: 2200 Defense: 1800 2 Tuners