You don't have to build Runo with just sea monsters (serpents, leviathans, krakens, and octopi). You can still build him with the best of those creatures but also enter-the-battlefield creatures since Krothuss will still copy any attacker, even if it's just once.

Here's the link to the decklist: https://tappedout.net/mtg-decks/22-11-21-runo-stromkirk/?cb=1637592481

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