Dazzling Sphinx

Combat damage cast-triggers usually steal something concrete off the top of the deck: the top card, the top creature, whatever the dig turns up. This one narrows the reward to two card types and hands you the payoff for free. The dig runs until it hits an instant or sorcery, and you cast that spell without paying its cost, so the trigger only functions as well as the defender's spell density. Hit an empty pocket of permanents and you burn through a chunk of their library, sending the whiffs to the bottom in random order without ever shuffling; hit a spell-heavy deck and a single connection can fire off a tutor, a removal spell, or whatever big instant is buried at no mana. The 4/5 flying body is deliberately unglamorous: it survives most one-shot removal and clears the ground, but it is not fast, and the ability rewards patience over pressure. What makes the design worth studying is where it points the reward. Most "cast off the top" effects care about raw card advantage; this one cares about the shape of an opponent's library, turning their instant-and-sorcery count into your resource and asking you to read a table before you swing. Sending the residual cards to the bottom rather than the graveyard is the restriction that keeps it from doubling as a mill engine: you scramble an opponent's sequencing without ever emptying their deck.