Bedlam

Combat math gets a lot simpler when nobody is allowed to block. The effect is symmetrical, which is the design joke and the design problem at once: defense stops existing for both players, including the one who cast it. That looks like a wash until you remember who built the board. The shell that profits is the all-in aggressive one that would rather not block in the first place, happy to have every creature swing into open air each turn and let the faster clock win the race. Falter effects buy a single attack step; this is the permanent version, a static lock that converts every subsequent combat into a foot race the prepared player has already entered ahead. The cost is paid up front in a card and four mana, and the payoff is that chump-blocking, gang-blocks, and deathtouch walls all stop mattering at once. Note the asymmetry the symmetry hides: it removes the option to block, not the obligation to attack, so a defensive creature with no incentive to swing simply sits there as a useless body rather than getting drafted into the offense. The player who can deploy threats and close before the opponent's slower board matters is the one who comes out ahead. Built for the aggressor who treats blocking as someone else's problem, and dead weight to anyone hoping to grind.