Thunder Salvo

Removal that scales with your own spell count is a rare beast, and the two-damage floor is the tell that this was built to be castable as a plain kill spell first and a payoff second. On an empty turn it clears the small stuff for two mana, unremarkable at that price; the interest lives in how quickly the multiplier gets away from you. Cast a cantrip and a cheap burn spell ahead of it and the target size climbs past what any two-mana instant should reasonably answer, turning a tempo card into a spell-chaining finisher aimed at a blocker or a resilient midrange threat. The timing subtlety is that it counts spells you have cast this turn, not spells that resolved: the count locks in the moment each spell hits the stack, so a fizzled or countered spell earlier in the turn still fed the salvo. That makes the sequencing forgiving in one direction and demanding in another; you want the volume up front, but you do not need any of it to stick. Instant speed keeps it from collapsing into a pure combo piece: you can still fire it as an ambush answer mid-combat when the count is modest. It contributes nothing toward reaching that critical mass itself, which is the honest ceiling on how good it gets. Outside a spell-dense deck it is a slightly overpriced removal spell; inside one it punishes an opponent for tapping out first.