Teferi's Curse

Most cards that interact with phasing want it for themselves: grant it to your own permanent and it slips out of existence before a removal spell can land. This Aura inverts the instinct, bolting the mechanic onto something an opponent controls and turning a defensive trick into a relentless metronome. Every other untap step the enchanted permanent phases out on its own, and while it is gone it cannot block, cannot attack, cannot be tapped for an ability, and cannot be targeted; the opponent has to plan combat and tempo around a clock that ticks whether they like it or not. Pointed at an artifact, the curse intermittently shuts off a mana rock or an engine on the same forced cadence. The elegant friction in the design is that nothing is ever destroyed: the permanent's Auras, counters, and attachments phase out alongside it and return intact, which means this denies reliable access without ever feeding a death trigger or a graveyard-recursion payoff. The strategic axis it warps is permanence itself, recast as a part-time condition the controller of the permanent does not get to manage. Phasing proved confusing enough that it largely retired after this block, so cards built around imposing it on others, rather than granting it to your own things, remain a small and strange family. This is the cleanest example of the offensive read on a mechanic almost everyone else treated as protective.