Chamber Sentry

The five-color promise hides inside a card that costs nothing on its own. Cast it for and the number that fixes its whole value comes not from X but from how many colors of mana paid the bill: a five-color casting arrives as a 5/5, a mono-colored one as a fragile 1/1 holding a single shot. That coupling of body to color count is the entire design tension, a deckbuilding tax priced in mana sources rather than mana value. What you buy by clearing it is a burst pinger: pay , tap it, strip X counters, and it dumps X damage at a target all at once. The catch is that those counters are the body. A 5/5 that fires for five removes all five and dies to the activation, so the damage it deals is measured out in pieces of itself, spent for good. The card wants you to size it once, then decide in a single moment how much of it to convert. Recursion is the second commitment: buying it back from the graveyard demands the full WUBRG spread, so a deck that wants to size and recast the construct is paying for all five colors twice over. Built for the rainbow shell where touching every color is already the point, it rewards manabases straining toward full fixing and offers almost nothing to a two-color deck, a resilient value engine only after the mana has done the hard work.