Hidden Retreat

Damage prevention without a mana cost is rare, and the substitution white makes here is the whole design: the shield is paid for in tempo and card depth, not from your pool. Every prevention demands a card off the top of your hand, replanted on top of your library where you will draw it again later. That makes the protection real but rationed; the more you lean on it the more your draws stall on cards you have already seen. The targeting is the other discipline. It answers only an instant or sorcery spell, so the card is built specifically against burn and direct-damage strategies rather than as a general fog. A creature swinging in is no concern of this; a stack of Fireballs is. The window matters too: prevention is set up for the whole turn against the chosen spell, so a single activation can blank a finisher regardless of how the opponent tries to split or sequence the damage. What keeps the effect from being oppressive is the rationing built into that cost. You can stop one big spell cleanly, or several small ones at the price of repeatedly recycling your hand back onto your deck, each loop costing you a fresh draw. It is a sideboard-shaped answer printed into a main-set enchantment, narrow on purpose, and meaningful only against the exact opponent who plans to win with a noncombat damage spell.