"One and done" is a term used in the TCG business to mean that the print run for a product is limited. 'We are doing one limited print run, and it's one and done.' Or, worse case for rarity, UMA will have a second, and much smaller print run. Here is an issue I have with how this term is used when it's in reference to a FOMO (fear of missing out) cash grab like UMA: if that one and only single unique will never happen again limited print run is gigantic (which it looks like UMA's was-gigantic, I mean), then it does not matter that it's 'one and done.' Here are selected listings (listing 4 or more copies, and I only picked one screen shot of listings) for the top rare, bottom rare, and top uncommon (by selling price) for UMA.
January 2019 is going to be a great month for buyers of Magic singles. Happy New Year, fellow bottom-feeders!