A-Brine Comber // A-Brinebound Gift

The load-bearing trigger here is not casting an Aura but targeting: the Spirit half spits out a 1/1 flyer whenever it enters or becomes the target of an Aura spell. That second clause is the invitation. Point any Aura at this creature and it refunds a flyer on the way in, so every attachment becomes a two-for-one, and the token stream grows more reliable the more Auras you lean on. The trigger stays local to this permanent, not the board: Auras cast on other creatures do nothing for you, and the Auras themselves carry no token effect. The value engine is deliberately self-contained, spinning off flyers from a single body rather than asking a full Aura package to cooperate.

The disturb line is what keeps that engine from collapsing. Trade away the front-half body and it returns from the graveyard transformed as the Aura, refunding another token as it enters before exiling itself for good: a one-way, self-consuming recursion that rewards Aura density without demanding you overcommit to the fragile creatures those Auras want to sit on. It answers the perennial Aura-deck problem (that killing the enchanted creature blows out your whole investment) by making the payoff a body that comes back once on its own terms, converting a pile of cheap Auras into a widening flying board instead of a single point of failure.