As an opponent of UBI you should know what economic and financial tools would be available, and then explain why they wouldn't work, rather than act like they don't exist. It would help your counter argument.
Otherwise I could say "erasing money would make us live like aristocrats" without explaining how or why, and you should try to figure out why I could think that way, what kind of tools and mechanisms I thought of and after that, explaining why it would not work. Obviously, I could say those are not the right tools for my idea, so you have no real counter arguments, yada yada yada...