Metathran Zombie

Blue's flirtation with a black keyword, packaged inside a body that does almost nothing with it. The Metathran were Dominaria's manufactured blue artificial life, and the designers leaned on that flavor to license an off-color regeneration ability on a card that is otherwise mono-blue. As a creature, the rate is unremarkable and the regeneration is too small to matter: spending a black mana to keep a one-power body alive through combat or a board wipe still leaves you a one-power body. What the card actually documents is a design philosophy that defined its block: nearly every common and uncommon was stamped with a second-color activation to reward the two-color decks the era wanted you to build, even when the resulting card did little on either axis alone. The off-color ability here is the tax for entering that gold-card economy, not a reason to run the card. It survives as an artifact of how aggressively a single block can bend its commons toward a theme, asking you to splash a color for an effect that rarely repays the splash.