If true, then any bonus after Level 3 could potentially have no use inside duels at all, being intended for the Unlimited Nuetral Field.
Though the Mystic Reins might be a found item rather than a bonus item, it's pretty clear that one can't use it outside of the UNF, where the Enemies live. (The reins probably store the last captured Enemy, too; otherwise Pot would need to hunt down and capture Nidhogg after every time he left the Field.)
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