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 Nest War deals 1/2 damage to that player.

（仮訳）

2メートル以上離れた場所から Nerf blaster が弾切れになるまで対象のライブラリーに向けて撃つ。そのライブラリーから弾かれたカードをオーナーの墓地に置くとともに、そのプレイヤーにその枚数の1/2のダメージを与える。

（一部抜粋）

we’ve decided that we need to ban an additional card. Nerf War isn’t problematic mechanically, and we figured that we didn’t need to tell people that they were responsible for making sure not to damage other people’s cards.However, we’re seeing a lot of people planning a shock and awe approach to try and force a concession, and that’s very much missing the spirit of the format. It’s also a bit problematic encouraging people to run around game stores and conventions with gun-like objects, and so we feel that Nerf War needs to be removed.