![[ACD] Ancient Gear Booster Empty](https://2img.net/i/empty.gif)
Ancient Gear Booster
![[ACD] Ancient Gear Booster 152px-AncientGearBooster-JP-Anime-AV](http://img3.wikia.nocookie.net/__cb20150322142015/yugioh/images/thumb/e/e9/AncientGearBooster-JP-Anime-AV.png/152px-AncientGearBooster-JP-Anime-AV.webp)
Once per turn, if an "Ancient Gear" card you control activates an effect that would inflict effect damage: You can double that effect damage.