If your opponent Special Summons a monster(s) face-up (except during the Damage Step): You can discard this card, then target 1 of those face-up monsters; negate its effects until the end of this turn, also if that face-up monster leaves the field this turn, its controller takes damage equal to its original ATK. You can only use this effect of "Ghost Mourner & Moonlit Chill" once per turn.
![Ghost Mourner & Moonlit Chill [RA04-EN033] Quarter Century Secret Rare | Jomio and Rueliete's Cards and Comics](http://jomio-and-ruelietes-cards-and-comics.myshopify.com/cdn/shop/files/626853.jpg?v=1752850305)
