Soulfire Eruption

Nine mana of triple-red buys a spread of fireballs whose sizes you don't get to know until they land. You pick the targets first, dividing them across creatures, planeswalkers, and players however you like; only then does each one flip a card off your library, dealing damage equal to that card's mana value. The wager sits entirely in your curve. A deck built to spike this wants a top end heavy enough that the flips hit for real numbers, but load up on one-drops and the eruption sputters into a handful of points and a modest refuel. That tension between consistency and payoff ceiling is what the card is built around: it rewards the same big-mana shells that can actually assemble a triple-red nine-drop, and punishes the ones that can't stomach the variance. What separates it from a straight X-burn finisher is the permission to play the exiled cards through your next turn (you still pay their costs, so the second wave costs you again, but you're drawing from a pile you've already seen). The damage is the opening act; the follow-up is a windfall of extra spells rather than a free cascade. In practice it swings as readily into a board-clearing haymaker as a face-burn kill, an aimable fan of Fireballs where you commit the mana up front and learn the sizes on resolution.