Bituminous Blast

Five mana for four damage to a creature is a rate nobody would pay on the removal alone; the cascade trigger is what makes the math break in your favor. Cast it and you dig until you flip a free nonland spell that costs less than five, cast that for nothing, then still kill the creature. That free hit is what turns a slow removal spell into a two-for-one, and the cascade lottery is weighted by your own list. Cascade exiles until it finds the first legal hit, so every cheap spell you add lowers the ceiling of what you can flip. Stack the deck with high-impact four-drops and the trigger reliably lands a body or a second removal spell; run too many one- and two-mana pingers and you whiff into something you may not even want to cast. The instant-speed window is the part that gets undersold. You can hold this up as interaction, fire it on the opponent's turn in response to an attack or a combat trick, and bank a free spell off the top while you do it. It belongs to the small family of cascade cards printed as instants, where the value engine and the reactive timing pull against each other in a way the sorcery-speed cascade spells never have to resolve: the spell cascade hands you is free, but it resolves on its terms, not yours, so ambushing a creature on the wrong turn can mean dumping a four-drop you would rather have set up.