Tangle

Most fog effects buy you a turn and ask nothing of your opponent in return: Fog, Darkness, the whole lineage of "prevent all combat damage" tricks resolve, the attackers go home, and the board resets to where it started. The second clause here is what changes the math. By keeping every attacking creature tapped through its controller's next untap step, this punishes the swing rather than merely surviving it: an opponent who commits a full attack into it spends not one turn but two, the turn of the blank attack and the turn their creatures sit sideways unable to block or attack again. That window is exactly what a green ramp or combo deck wants, because the price of a wide attack becomes a defenseless following turn. The cost is borne entirely by the attacker, which makes it a tempo swing dressed as a defensive spell. The friction is that it does nothing against a player who simply doesn't attack into it, and the tapped-down clause only bites creatures that actually swung; a held-back board walks away clean. As a piece of green's anti-aggression toolkit, it sits a notch above the pure fogs precisely because it converts a defended turn into a counterattack, turning the act of attacking into a liability for the aggressor.