Discovery // Dispersal
The split-card frame is doing real design work here, not just stapling two effects together. The front half is pure cantripping efficiency: a two-mana sorcery that filters the top two cards and replaces itself, the kind of low-friction smoother a control or midrange deck wants to fire off when nothing else is happening. The back half is a five-mana instant that asks for a board state to punish: returning each opponent's biggest nonland permanent to hand and forcing a discard, which lands hardest exactly when the opponent has committed a haymaker. What unifies them is the Dimir reading of card advantage: the front fills the graveyard while it smooths your draw, the back hits the opponent's resource development at instant speed. The dual nature solves a real deckbuilding tension that single-mode cards cannot: a flexible spell that is rarely a dead card. Early, you cast Discovery to dig; later, you hold up Dispersal as a tempo swing against a committed threat. The two halves never want to be cast at the same time, and that is the point. The CMC of 7 listed on the page is the combined value of both faces, not a cost you ever pay; each half stands alone, and the card earns its slot by giving you the right tool at two different points in a game.
