Rancorbait has reviewed the window contents again today:
On day thirteen we have a standard tan Battle Droid to combat the Clone trooper presented by CapnRex101 on day ten. This figure is by no means uncommon, it has been included in many Star Wars sets since 1999.
This figure, although rather dull in my opinion, is great for army building and are not hard to come by at all. Since the rest of the advent calendar seems to be heavily Attack of the Clones based, I think a dark orange one would have been more suitable, but either are welcome. Unfortunately, this Droid, like all the other figures in this advent calendar so far, is unarmed, but that can be fixed thanks to the weapon rack from day seven.
There isn't really much to say about this minifig: I'm sure most, if not all of you have seen a Battle Droid before, so nothing special, but great to have anyway, after all, you can't have to many of them!
Overall - 3.5 - While not particularly exciting, its always great to have more Battle Droids to expand your army.