Tamanoa

Lifegain triggers usually attach to a target, a creature's combat step, or a "whenever you gain life" payoff. This Spirit attaches to something stranger: the type of the source dealing damage. A burn spell, a planeswalker's minus-loyalty bolt, an artifact that pings, the recoil from a self-damaging effect that bites back: those are all noncreature sources, and every point they deal to anything (a creature, an opponent, even yourself) returns as life. The catch is unforgiving in the other direction. A creature that taps to deal damage is still the creature dealing it, so the obvious lifegain-pinger build does nothing here. That single technical line is the whole identity: it ignores targets, ignores who controls the damaged permanent, ignores whether the damage is direct or incidental, and triggers off the source's type alone, an unusually wide net hung on an unusually precise hook. The 2/4 body confirms this was never meant to win on its own; it contributes nothing in combat and asks you to assemble a noncreature damage engine around it first. Pair it with a repeatable noncreature ping and the lifegain stops being incidental and becomes the payoff of a loop. The Naya color cost (printed before that shard had a name) states the intent plainly: a deck built on spells and devices that throw damage, with the Spirit standing in the back inflating the life total while the actual engine runs.