2+ Effect Monsters Unaffected by your opponent's card effects during the Battle Phase only. Once per turn (Quick Effect): You can target 1 face-up monster on the field; banish it until the end of this turn. During the End Phase of this turn, return that monster to your zone this card points to, but banish it if it leaves the field. (Quick Effect): You can Tribute this card, then target 2 DARK Dragon monsters in your GY with 2000 or less ATK; Special Summon them. You can only use this effect of "Borrelvalve Dragon" once per turn.