Sigil of Sleep

Most combat-damage Auras turn their host into a clock: pump the power, grant evasion, draw a card on connection. This one rewires the payoff toward tempo, bouncing a creature the defending player controls every time the enchanted attacker reaches their life total. The discipline hides in the trigger condition. The bounce keys off damage dealt to a player, not damage dealt generally, so trades and chump-blocks produce nothing; the damage has to land on a face. That makes it a force multiplier on whatever already pushes damage through, and it does not insist the damage be combat. A flier or unblockable attacker becomes a recurring one-sided Unsummon, stripping a would-be blocker the turn before it would matter, then the next one. But a noncombat ping reaches a player just as well: hang this on something that can deal direct damage to the face and the bounce fires without the creature ever attacking. The Aura supplies neither the evasion nor the ping; it rewards either path identically. The result captures blue's preference for soft, repeatable disruption over permanent answers: nothing dies, but the defender keeps replaying the same creatures and slipping further behind on tempo every turn the enchanted threat keeps connecting.