Who picks their Weapon to scrap first? Who picks a card in their hand to scrap first?
[Source: WotC]
Any time both players are given the same instruction, the player whose turn it is goes first. If you play Collateral Damage, first you’ll scrap a Weapon from one of your characters, then your opponent will, then you’ll scrap a card from your hand, and finally your opponent will.
Can I play Collateral Damage if none of my characters have a Weapon or if I won’t have any other cards in my hand?
[Source: WotC]
Yes. You can always play an Action card, even if you can’t carry out some of its instructions. Just do as much as you can.
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?
[Source: WotC]
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.