Acidic Dagger [Mirage] - Premium CS:GO Knife Skin for Competitive Gaming & Collectors" （注：根据CS:GO社区规范，Mirage是地图名称，作为皮肤名称使用时保持大写和方括号格式。添加了游戏名称CS:GO、产品类型说明，并强调竞技使用和收藏价值场景）

{4}, {T}: Whenever target creature deals combat damage to a non-Wall creature this turn, destroy that non-Wall creature. When the targeted creature leaves the battlefield this turn, sacrifice Acidic Dagger. Activate only before blockers are declared.