Frantic Firebolt

Burn spells that scale off your own graveyard usually count instants and sorceries and stop there; the counting rule here quietly folds in a third category, since any card with an Adventure also feeds the pile whether it went there as the adventure half or the creature half. That widens the math in a way that rewards a deck already casting cheap adventurers for tempo rather than one purpose-built to stuff a graveyard. The floor is honest: two damage before any counting happens, so it never bricks the way delve-style scalers do against an empty yard. From there each qualifying card adds a point, and a full midgame graveyard can push the number well past what the cost suggests. The real design tension is the target line: it only points at creatures, never at a face. That restriction is what keeps the scaling from turning oppressive. You can grow X as high as the game allows, but every point of it is always spent clearing a single blocker or threat, never closing the game directly. What you get, then, is a piece of interaction that gets better the longer a game runs, priced to reward the exact graveyard a tempo-adventure deck builds anyway, and hard-capped by the fact that it can only kill one thing at a time.