Living Airship

Pay the regeneration cost and you learn what this creature is for. A blue flyer whose only real text is a green shield, it asks one question no mono-blue card could ask: can you afford the off-color mana to keep an evasive body alive through a removal-heavy board? It pairs two enemy colors in a single body, the kind of design that surfaced when the color pie opened wide enough to let enemy splashes flow without a gold frame to justify them. The Metathran were Urza's engineered soldiers, bred to throw against the Phyrexian invasion, and the regeneration cost reads as fiction rendered into rules: the airship simply rebuilds itself rather than dying. Mechanically the activated ability is the whole bet. The 2/3 flying body is a slow clock, but green's regeneration is a flavor of resilience blue almost never gets to buy, and the splash into an enemy color is the premium you pay for it. As a specimen of that enemy-color splash experiment it is a modest one, never a constructed staple, but it documents the moment a blue creature was allowed to want green mana at all.