Chronomantic Escape

A Fog that refuses to leave, and the design lives in its second line. The defensive effect is ordinary: for one turn, creatures can't attack you. The wrinkle is the self-exile clause, which fires every time the spell resolves and sends it back out with three time counters, regardless of how it got onto the stack. Cast it for full price and it fogs the next attack step immediately, then re-suspends itself to return three upkeeps later. Pay the suspend cost instead and you defer that first fog by three turns to save three mana up front. Either route locks the spell into a fixed cadence: once it's running, it resolves every third upkeep and shuts off one combat step at that interval for as long as the game lasts. The "creatures can't attack you" wording is the tell that this isn't a true Fog: it shields you specifically, indifferent to where your own attackers are committed, and does nothing about noncombat damage or a board that wins without swinging. The trade is flexibility for inevitability. A plain Fog answers the exact turn you call for it; this one answers a turn fixed three upkeeps out, then keeps answering on its own clock whether or not the threat arrives. That bargain only pays in a deck built to grind a hostile board to nothing while assembling a win the timer can outlast. Outside that frame, the floor is a six-mana speed bump that happens to echo.