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Equivalent cards to Seafaring Werewolf (Blue, Werewolf, daybound/nightbound):
1. Brine Comber — Blue transform card.
2. Suspicious Stowaway // Seafaring Werewolf itself—Other werewolves with similar mechanics in blue do not exist, but you might try Delver of Secrets // Insectile Aberration (transform, evasive, transformative threat in blue).
Reason: Blue has very few werewolves; for transform and evasion effects like Seafaring Werewolf, Delver of Secrets is a functional, color-appropriate equivalent.