Survival Cache

Rebound turns a modest white maintenance spell into a two-payment annuity, and the conditional draw is what makes the second payment worth waiting for. Cast it from your main phase and you gain two life with a likely card off the top; exile it on resolution, and your next upkeep offers the same two-life-and-a-card cast for free, this time with your life total already padded by the first cast so the "more life than an opponent" clause is closer to a formality. The conditional governs the cantrip: you only refill your hand when you are ahead, which makes the spell a reward for the life-gain decks that want to be ahead anyway rather than a free draw in any shell. The rebound clause answers a problem that has always dogged incremental life-gain effects, which is that a single point of life and a single card rarely justify a whole turn; here the spell asks for one cast and pays out twice, smoothing the rate into something a slower deck can lean on across two turns. White's card advantage normally has to be earned through creatures and enchantments that survive a turn cycle, and this compresses that trickle into a one-shot sorcery that quietly does the work a second time on the house.