I am just surprised as I have seen some of the prices on untamed rise since they were released. And I thought with the release of the golems that the cap would grow more at 5 and 50 for normal and gold foil. I was surprised when I saw that it was down on today's post. Had to go back and verify we had lost by revisiting your post 2 days ago.
I was surprised to see the drop as well. I had the same thought process as you with the Golems being released. I know the overall Beta Market has been dropping. I loosely been keeping track using my Beta collection value as the starting point.
I don't have the numbers in front of me but looking at my collections value I would estimate that my Beta cards lost about $500 of value out of a $6000* collection.
We are also starting to see some 3 cent untamed commons and I suspect the majority of the UNTAMED commons will follow that trend and at some point be closer to 1 cent. Again that's a short term guess / Long term I have no clue what the value of these cards might be.
I think untamed can fall more because untamed has less DEC value than beta cards.

View or trade BEER.
Hey @r1s2g3, here is a little bit of BEER from @rentmoney for you. Enjoy it!