Hisoka's Guard

Protection that you pay for by sitting a body down. Activate once and this 1/1 hands shroud to one of your other creatures, but the shroud only holds for as long as the guard stays tapped, which is the whole reason it may decline to untap. The cost is a single payment up front; the upkeep is positional rather than mana-based. Every turn you want the protection to persist is a turn this creature does nothing in combat and adds nothing to your board, frozen as the anchor of the effect. Untap it and the guarded creature is exposed again. That continued idleness sets it apart from a one-shot protection spell that fires and is gone, and it means the shroud is only as durable as the guard itself: kill the wizard and the protection vanishes the instant it leaves. It belongs to a school of permission-based defense where keeping a creature untargetable cost a card, a body, and that body's ongoing presence rather than a keyword stapled on for free. It wants a deck built around exactly one threat worth defending, since the shroud is single-target. And the wording cuts both ways: shroud locks the guarded creature out of your own targeted spells too, so no auras, no equip triggers, no pump spells land on it for the duration of the lockdown.