Cerebral Eruption

A sweep whose payload is decided by the opponent's deck, not by you, which is the whole gamble. The damage scales to the mana value of whatever sits on top of their library, so against a control deck stacked with five- and six-drops this reads like a one-sided board wipe that also burns the player; against an aggressive deck full of one-drops it does almost nothing. The land clause is the genuine wrinkle: reveal a land and the spell bounces back to your hand, so you can fire it again next turn rather than wasting it. That turns a high-variance burst into something closer to a repeatable probe, since a deck heavy on lands keeps handing the card back while you wait for an expensive nonland to surface. The catch is that you never get to aim it: the opponent's draw order does, and a topdeck you have no information about can leave you holding a four-mana sorcery that deals zero. It belongs to the family of effects that try to convert opponent-information into damage, and it sits at the unstable end of that family, where the ceiling is enormous and the floor is empty. Built for players willing to trade reliability for the occasional blowout, it rewards a read on the opposing curve more than anything in your own hand.