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Are you allowed to play Collateral Damage even if you do not have a weapon on the field? Or if there are no weapons on the field for either players and you just want the discard effect?

You can play Collateral Damage even if there are no weapons on the field or cards in your hands to scrap. Do as much as you can.
Source: Wizards of the Coast (2019-05-10)    【Link to Ruling】
Tags: Collateral Damage