Staff of the Sun Magus

Three generic mana buys an artifact that does nothing on entry and instead pays out a single life every time you cast a white spell or a Plains enters under your control. That trickle is the entire engine, and it pegs the card to the lifegain-payoff family of role-players that surface when a set wants to support a soul-sisters-style life-total deck without printing yet another body. The quiet design choice worth noticing is the artifact framing: by living on a permanent that triggers off a spell's color and a basic land type rather than off a creature, it sidesteps the usual lifegain-engine weakness of dying to creature removal, and it stacks with bodies that do similar work rather than competing for the same slot. The trade is that one point per trigger is genuinely small, so the card only earns its keep in a build dense enough in white spells and Plains to turn that drip into a meaningful subtotal across a game. This is honest, narrow incremental design: a cog for decks that want many tiny gains to accumulate toward a payoff elsewhere, not a card with a moment of its own.