I have my custom sleeve art ready to go, but I think a sea serpent-themed deck needs a few more pieces to work swimmingly
According to Card Kingdom at the time of writing, the most expensive card from the Final Fantasy Magic: The Gathering set is the black ink, foil, borderless Traveling Chocobo card that's currently only available in Japanese
While the "ease of flipping" category is, in large part, a product of the number of defense counters on the battle (battles range from three to seven defense counters, and a battle with three defense counters will be much easier to flip than one with seven), it also takes other factors into consideration, like whether the battle makes creatures (if so, we can use them to help defeat the battle, making it easier to flip) or whether the battle acts as removal (which can get a blocker out of the way, making it easier to attack and defeat the battle)
As a result, Intrepid Adversary is a great creature to throw down at any even point on the mana curve, as long as you already have creatures on the battlefield