There are three potential commanders in Deep Clue Sea, but only Morska, Undersea Sleuth enables the deck's core theme
A majority of decks use Broken Time-Space, so either using yours or your opponents, chances are you wont use all your Rare Candies and drawing into them may pose as a bother
Captain Storm, Cosmium Raider 0227_MTGLCI_Main: Captain Storm, Cosmium Raider If you want to go in a more Treasure- and Vehicle-focused direction, Captain Storm can make combat extremely difficult for your opponents
So for four mana and four turns, your net result is either a 2/2 or 3/3 creature with no abilities other than to phase out again
If we first look at Standard, we can see there are plenty of spells players want to cast that cost five or more, especially Leyline Binding (which never really costs five), and the enchantment side of Virtue of Persistence
Not all in the world is doom and gloom