Kukemssa Serpent

Islandhome is the drawback nobody remembers: a sibling of islandwalk that, instead of making a creature unblockable against blue, forbade it from attacking unless the defending player controlled an Island. This Serpent takes that restriction and bundles its own solution. The activated ability converts an opponent's land into an Island, manufacturing the very condition the creature needs to swing, so a body that was locked out can now beach itself on borrowed shoreline and declare an attack. The catch is what keeps the trick honest: every conversion sacrifices one of your own Islands, so you are paying a full land per attack and burning down your own manabase to do it. That is not a speed bump; it is a fundamentally unsustainable rate, and the third clause finishes the thought by sacrificing the Serpent the moment you run dry. Note also that the conversion only satisfies the attack restriction; once it swings it can still be blocked like any other 4/3, so what it buys is access to the red zone, not safe passage through it. The flavor lands clean in a set whose blue identity leaned hard on the sea: a sea serpent that can only reach the enemy by dragging water across the battlefield ahead of it. The design instinct is pure mid-nineties blue, where drawback creatures came wrapped in fiddly self-referential clauses rather than the clean keywords later sets would prefer, and where the cost of attacking was paid in cannibalized lands rather than printed honestly into the stat line.