Sanctimony

Color hosers are one of Magic's oldest design instincts, and few of them ever got as narrow or as passive as this one. It does nothing against four-fifths of the color pie: it watches for a single trigger, an opponent tapping a Mountain for mana, and pays you one life each time. That is the entire engine, an attrition wager against a mono-red aggressor where every land they tap to fuel a burn spell or a beater hands a sliver of life back, nudging the race they need to win. The wrinkle that makes it so conditional is that it keys off the land type, not the color: a deck splashing red off duals and shocklands triggers it just the same, while a red opponent built mostly on non-Mountain sources slips past untouched. So it lives or dies on how committed the enemy is to actual Mountains, which makes it a bet on the format's manabases rather than its threats. And unlike a real answer card that removes a problem, this one removes nothing; it only gains life, and only when the opponent obliges by tapping the right land. This is surgical to the point of helplessness: hands-off, contingent, waiting on an opponent to walk into a trap rather than forcing them into it.