Angelheart Vial

Most lifegain rewards you for being attacked; this one charges off the punishment itself, converting incoming damage into stored fuel. The counters do not arrive on a clock you control: an aggressive opponent loads the artifact faster, a stalled board feeds it nothing, so the engine runs hottest exactly when you are under the most pressure. That inversion is the whole design idea. Damage you take is normally pure downside, but here every burn spell to the face and every connecting attacker is a deposit, and four counters cash out into life and a card at the same time. The math has a deliberate tax built in: you need to have taken at least four damage before the activation does anything, and the activation itself costs mana and a tap, so this never stabilizes a board on its own. It pays you back slowly, over multiple turns, for the privilege of being a target. The result is a payoff card for the player who plans to absorb hits rather than race: a grindy, attrition-minded engine that turns a defensive posture into a steady trickle of cards. It asks you to be patient and to be willing to bleed, which is a narrow band of decks, but inside that band it answers a real question: what does a control deck do with the damage it was always going to eat anyway?