Lifegain Source

Cards whose own text causes you to gain life on a recurring or stackable basis: enter-the-battlefield gain triggers like Soul Warden and Suture Priest, passive opponent-punishers like Authority of the Consuls, upkeep tickers like Fountain of Renewal, and per-spell gainers like Aetherflux Reservoir. These are the engines that feed a lifegain shell with repeated life-change events. Distinct from lifegain.lifegain_payoff, which rewards life gain rather than producing it, and from lifegain.drain, which moves life from opponents to you in a single linked event. Lifelink-only creatures are excluded; the keyword is tracked separately and isn't itself a dedicated lifegain engine.