A few weeks ago a 2016 Topps Stadium Club Beam Team Gold of Andrew McCutchen popped up for sale.
These don't command a lot of money on the secondary market, but they are very difficult to come across as they are inserted only 1 per case. Not being numbered (or Topps providing a print run) helps to keep the prices low.
They can be had for only about $5+ and feature a great design that made the original stadium club run from the 90s so popular initially.
I don't know what caused Topps to send this particular card in a sealed top loader, but it makes it that much more unique to add to the collection.