Whirlwind Denial

A Fog for the stack, resolved at the one moment a single blue card usually feels helpless: the opponent's combo turn. Where most permission names a target or a type, this refuses whatever is standing on the stack when it resolves, taxing every one of your opponents' spells and abilities in the pile by at once. That is the crucial timing wrinkle. It does not hang a lingering tax over the rest of the turn; it looks at the current contents of the stack and applies a per-object toll to each. So it wants to catch a chain mid-assembly, when a storm or combo turn has already stacked half a dozen triggers and copies, rather than sitting up as a preemptive wall. The "unless its controller pays" clause turns this from a blowout button into a friction generator: a deck built to cast far more than its mana total should allow suddenly needs times each object in the pile or watches the sequence buckle. That density is the whole axis. Against one big spell it is an overpriced counter that anyone with mana open shrugs off. Against a stack groaning under ten objects, it is a hard stop no reasonable mana base can pay through. The card is a specialist by construction: inert against fair midrange, punishing against any deck that treats the stack as a conveyor belt and forgets to leave the window closed.