Flood of Recollection

The trade here is single-use regrowth for a tighter price, and the design does the math honestly: two blue mana buys back any instant or sorcery, but the spell exiles itself rather than loitering in the yard as a recurring target. That self-exile is the whole balancing act. Regrowth and its blue descendants have always had to reckon with the loop problem (a recursion spell that can return itself, or be returned by another recursion spell, becomes an inevitability engine), and this one solves it by simply removing itself from the conversation after one use. You get a clean one-for-one swap of a card and two mana for whatever spell in your graveyard most needs to come back, with no aftertaste. The color restriction is the other half: blue rarely gets to reclaim its own counterspells, card draw, and tempo plays from the bin, and confining the effect to instants and sorceries keeps it from doubling as a creature-recursion tool the way green's versions do. The result is a narrow, well-behaved piece of attrition insurance: it does not generate value on its own, it does not chain, and it asks only that you have already cast something worth a second look.