Aether Burst

Most bounce spells scale with mana; this one scales with itself. The clause counting copies named Aether Burst across every graveyard turns a single-target tempo play into a multi-creature swing the second and third time you cast it, and the count is taken on cast, so the trajectory runs one direction: the more copies already spent and sitting in graveyards, the larger the next one lands. The first copy sees zero in the bin (X equals one) and reads like a plain Unsummon. The second sees one, returning up to two creatures. The third sees two, sending three back at instant speed for two mana, enough to unwind a sizeable board commitment in a single resolution. The unusual part is that the design rewards you for having already used it: the card gets stronger as the game goes long rather than weaker, and it does so without a recursion engine or a dedicated graveyard payoff. The graveyard is just the tally, and the spells fuel the count by being spent. That resolves a real tension in cheap repeatable tempo tools: how to grant late-game reach without making the early copies oppressive. The answer here is to make the ceiling a function of how many times you have committed to the plan, not how much mana you can pour into a single cast.