welcome. poison dial has got hard counters nowadays. + shards needs quanta, it's unlikely to win against a PC deck, DBH, anything with purify (although sometimes it can still defy the odds). I farm happily with it and got all my cards upped now, so,why stop at a few let downs, of course, if you noticed lots of decks counter yours, stop farming a day or 2 using that. When the decks changed, you get your chances again