Mangara's Equity

A color hoser that punishes rather than prevents: you lock it onto black or red as it enters, and from then on it answers damage dealt by a creature of that color to you or to a white creature you control by firing the same amount straight back at the source. The structural quirk is that it sits inert until a creature of the chosen color connects, then mirrors that incoming damage in kind. That makes it a reactive deterrent rather than removal; a creature dies only if it deals enough to kill itself, so the card prices the chosen color's aggression instead of sweeping the board. The trigger keys on any damage from such a creature, not combat specifically, so a black or red pinger that turns its ability on you takes the hit too. The recurring upkeep payment is the discipline that holds the design in check: an open-ended damage-redirect with no maintenance cost would be a flat wall, but the ongoing tax turns it into a commitment you keep funding while it idles, waiting for the matchup to come to it. The white-creature clause widens the protection past your own life total to your board, positioning it as guard duty for a small white army rather than personal insurance. The choose-on-entry restriction is exactly why it reads narrow: a wall built against one color you can name in advance, not a tool you run blind.