Sight Beyond Sight

Rebound is the toll that makes a mediocre filtering rate worth the four mana. Looking at the top two and keeping one is a spread the earliest dig spells beat handily, but this one resolves twice: cast from hand it exiles on resolution, then returns free on your next turn. That turns one card spent into two cards gained, a genuine card-advantage engine rather than a smoothing wash. The two-turn split is the design's whole personality. Because rebound fires during your upkeep, the second look lands before you draw for the turn, so you are reaching into the top of a library you have not yet touched rather than re-sequencing after a fresh draw. It is delayed selection, spread thin and on purpose. One detail matters against the field: both resolutions put a card into your hand, they do not draw it, so effects that punish or replace drawing (Underworld Dreams and its kin, various draw-hosers) never see a trigger. And rebound only fires from a hand cast, which is the restriction that caps the engine at up to two resolutions off a single cast: it cannot copy itself, cannot be recast a third time from exile, cannot chain. Unlike flashback, though, the spell ends up in the graveyard after its rebound resolution rather than exiled forever, so a recursion shell can retrieve it and start the two-turn dig over.