Concussion Grenade

Attach: B

While this Weapon is attached to a Clash card you control, this Weapon gets, "Whenever the attached Clash card attacks, you may attach this Weapon to target Clash card defending player controls without paying its attach cost."

While this Weapon is attached to a Clash card you don't control, this Weapon gets, "Whenever the attached Clash card readies, put that Clash card on top of its owner's deck, then send this Weapon to Oblivion."