I was about to open many untradeable packs and before that, I did one mid icon SBC to clear gold fodders in my club in order avoid duplicate. I only spent 100k total on buying tradeable players to fill the gaps and then I got Ronaldinho!!!!!!!! A 1.65 million player that I will never be able to afford! Looking at his hair in the game is the most enjoyable thing I have ever experienced in FIFA 20.
This is my fifth mid icon SBC and in the previous ones I got Gullit (another guy with OP hair), Best, Zanetti, and Veron. Everyone except Veron went into my current squad (if you find a squad with two god icons and some cheap players in other positions, that may be mine).
I really think mid icon SBC is a great place to recycle untradeable fodders. At this stage it is just so easy to get untradeable high rated cards from objectives, SBC card rinsing, red picks, etc. With little cost, you get chance to gamble something great, why not? Of course ignore me if you have already assembled a god squad...