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You can make the case that other creature types such as crabs and even merfolk are sea creatures, but these Big Four have been batched on multiple cards and all tend to be big-mana, high-toughness creatures

Is it acceptable to use these cards when following normal Pokmon rules

Well be brewing with legendary creatures from Commander Legends for quite some time

When they enter the battlefield, if you cast it, search your library for up to five Dragon cards not named Tiamat that each have different names, reveal them, put them into your hand, then shuffle. Its nice to draw cards, and drawing five powerful Dragon cards is even nicer

Emrakul, the Aeons Torn The apex of Eldrazi threats, Emrakul, the Aeons Torn has warped formats for years