Witcher 3 Best Gwent Deck For High Stakes. The one i'm talking about is the first opponent on the gwent championship. Start the high stakes quest at the passiflora.
Go to passiflora and talk to the scribe who's there. 45 xp, emhyr var emreis, the relentless card. The quest will rate your deck out of 5 and yes, it's possible to have a deck with 0/5.