Nerf War is a mythic Sorcery card from HasCon 2017 (H17), collector number 2. Current market price: — (foil $67.69), TCGplayer market prices via Scryfall.
Fire a Nerf® blaster until empty at target library from at least two meters away. For each card knocked off that library, put it into its owner's graveyard and Nerf War deals ½ damage to that player. (Foam darts only.)