Fishborg Launcher

Cannot be used as Synchro Material, except for the Synchro Summon of a WATER Synchro Monster. If you have a monster(s) in your GY other than "Fishborg Launcher", and all of them are WATER: You can Special Summon this card from your GY, but banish it when it leaves the field. You can only use this effect of "Fishborg Launcher" once per turn.