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 [ETCO-EN036] Starlight Rare | The CG Realm](http://www.thecgrealm.com/cdn/shop/products/b1c8f25a-73ef-50aa-a6b3-3a674f571124.png?v=1707267766)
