Youre pretty much going to need blue in your commanders color identity for a sea creatures deck to make a lick of sense, but these should be your main guiding principles
Some opponents might have effects like Propaganda or Kazuul, Tyrant of the Cliffs, which scale up with the number of creatures attacking
This list is a little handtrap-light, and I think theres some options which could be plugged in dependent on meta, such as Ash Blossom & Joyous Spring, or Infinite Impermanence
Tons of fans have recreated their favorite board, card and role-playing games, complete with elaborate custom tokens and scripts
Any of these commanders can be a fun choice for you and your opponents
games, this is a great entry point, its simple, basic to control and there is a lot of content and challenge to keep you busy, but more professional duelers and fans of the previous games will find a lot missing here