Sea Serpent

A vanilla-era artifact of land-matters design, back when "Islandwalk but inverted" was a flavor lever Wizards reached for to push players toward thematic decks. The conditional attack restriction is a vestigial cousin of landwalk, asking the opponent to be doing your thing for you to do yours; the self-sacrifice clause is the harsher half, punishing any deck that splashes blue for the body without committing to the color. The two clauses together encode a design philosophy Magic largely abandoned by the late nineties: that big creatures should carry environmental tax, that a 5/5 for six was a rate generous enough to warrant a leash. Modern blue fatties carry their costs in the mana value itself or in enters-the-battlefield drawbacks; the Sea Serpent template (a clean body with a flavor-driven activation gate) faded out as the color pie tightened and creatures stopped paying rent for being on theme. The card matters now as a fossil: the first printable answer to "how do we make a sea monster feel like a sea monster," and a reminder that early Magic treated basic land types as load-bearing strategic objects rather than mana-fixing substrate.