| Fusion Summon 1 WATER Fusion Monster from your Extra Deck, using monsters from your hand as Fusion Material, then, if you used "Fortress Whale" as Fusion Material, you can send 1 "Fortress Whale's Oath" from your Deck to the GY. If you control a face-up Field Spell, you can also use monsters from your Deck as Fusion Material. You can banish this card from the GY, then target 1 "Fortress Whale" and 1 Ritual Spell in your GY; add them to your hand. You can only activate each effect of "Fortress Whale's Fusion" once per turn.
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