Oh ok. I suppose I had mistakenly read your query. Apologies for that!
In order to randomize the other excel files that are written in one excel file, you would essentially need a code component. I would recommend looking into Randomly present all blocks and then in a reverse order. You would need to redesign the code according to your need.
Also, check if you have set the text box ‘Text’ column set at ‘set every repeat’ or else it will not loop. And as @dvbridges pointed out, there is a simple error of calling ‘opponent_file’ as ‘opponent_condition’. That should do the trick!
Hope this helps!