Its a way to wring a little bit of extra usefulness out of wounded cards, especially if theyve already been used to challenge and banish an opponents card
In the TMNT sets ecosystem, this is huge
Or if you dont want to Duel with a Deck made from your own collection, you can compete with the latest pre-made Decks in Structure Deck Tournaments
(For example on a purchase at 100 hammer price the buyer will pay a buyers premium of 136, inclusive of VAT (at 20%)
Whenever an opponents Partner is sent to the opponents Partner Zone from play, you take a prize card
Mill decks focus exclusively on decking out the opponent, while Stall decks focus on preventing the opponent from taking any Prize cards at all, eventually leading to a deck out victory