Faith's Shield

At full life this is a one-mana precision tool: a single permanent gains protection from a color, enough to slip a creature past a block or blank a burn spell pointed at your key threat. The inversion built into the second mode is the real design. Drop to five life or fewer and that same white mana sweeps protection from a chosen color across you and your entire board at once. Protection's four-part shield (it stops damage, blocking, enchanting or equipping, and targeting from the chosen color) means a well-timed cast against a mono-color or mostly-mono-color aggressor can erase a combat step and survive the follow-up spell. Naming the player as well as the permanents in that mode is what lets it shrug off effects aimed directly at you, edicts included, since a sacrifice spell targets the controller rather than any one creature. The base mode cannot do that: protecting one permanent does nothing against an edict, because the choice of what to sacrifice still passes to you. The gamble shared by every fateful-hour card is that the payoff only arms once you are already losing, which means courting the exact life total that turns the card on. That self-defeating threshold is what separates it from an unconditional protection spell, and what makes its best casts feel less like routine answers than like a hand snatched back from a board that had already counted you out.