Ichor Explosion

A board wipe whose magnitude you supply yourself. Most mass removal prints a fixed number and trusts the math to land; this one converts the power of a creature you already control into the size of the sweep, then makes you feed that creature into the spell to set the dial. The sacrifice is an additional cost, paid as the spell goes on the stack, before anyone gets priority: there is no window for an opponent to kill your fodder in response and leave you holding a -0/-0 dud. The number is locked in the moment you cast. What seven mana and a body buys is a symmetric sweep scaled to whatever you throw in: pitch a large enough creature and the table clears, your own side included, with only the creatures whose toughness exceeds that power left standing. The cost structure is the whole transaction. Designs that let the caster pick the size of an effect tend to be either trivially abusive or gated like this, behind a real mana investment and a creature you have to commit before you cast. The symmetry is what keeps the dial honest: you cannot crank X without measuring it against your own board, so the spell wants either survivors with toughness above the line you set, or a board so disposable that you do not mind it going down with the rest. A fat token or a creature about to die anyway becomes the lever, and the deck that fields it has already made peace with mutual destruction.