Krakens, leviathans, octopi, and serpents are literally called sea monsters in Magic
Card Details Stage: Basic [1] Windfall - Shuffle your hand into your deck
While on its own Munkidori ex might not be super impressive, and even in a deck with the rest of the legendary crew, Munkidori might not be putting up a huge fight, but it is still a cool card to collect
The key tweak is the shift in how energy works: rather than filling your deck with specific energy cards, you simply select the type (or types) of a deck when building it, and energy is automatically generated once per turn for you to attach how you wish (for two-type decks, which are required for the Dragon Pokmon lines such as Dragonites, which type comes up next is randomised, which effectively replicates a multi-type deck equivalent in real life)
Of those three abilities, the first is best for draft if the player has enough Adventure cards and they don't mind delaying an Adventure creature finally entering the battlefield after two Adventures