These cards have all seen play in high-performing Standard Blue-based decks of the past, with Tempest Djinn and Dive Down, as well as already Standard Opt and Chart a Course seeing play in Autumn Burchett's Mythic Championship I winning deck, back in 2019
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With Kiora, Sovereign of the Deep, however, you can jam as many Krakens, Leviathans, Octopi, and Serpents into your deck as you can while accruing more and more value from them
Check the rules beforehand as timings/games might be different, but tournament organizers should tell everyone before starting
However, you can use them to fuel the abilities of your permanents on the board, so they can be a powerful source of mana