I'm surprised no one mentioned mono-dark yet...imo it's the best unupped bronze farmer, narrowly edging out grabbow in my book.
This is the build I use.
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5uk 5uk 5uk 5uk 5uk 5ul 5ul 5ul 5ul 5ul 5ul 5um 5um 5um 5um 5um 5um 5up 5up 5up 5up 5ur 5us 5us 5us 606 606 606 606 606 8pt
Have you recorded your games?
42 wins/8 losses
Win rate = 84%
This deck was added to Xenocidius's arena decks thread here: http://elementscommunity.org/forum/index.php/topic,30564.msg415331#msg415331
You say it has a 84% win rate in bronze? well that means you lose slightly over a quarter of the time, to get that rare spin in bronze you have to win 6 in a row. well if you have to win 6 in a row and you loose 1 in 4, you will rarely get that special spin and therefor you are not make rares (unless your very lucky),not making good profit (unless you sell all cards you win) and therefor not making much profit in your bronze league farming.
First of all, I said I thought it was the best
UNUPPED bronze farmer, not upped. Actually, I just made another deck that has a higher win rate, so it's not top anymore, if my samples are accurate (I used small samples, so there's a decent margin of error).
Second of all a 75% win rate is VERY different from an 84% win rate. As it stands the chance to get a special spin when starting a bronze arena run with this deck is .84^6 = 0.351298032. So you've got roughly a 1/3 chance to get a special spin. A deck with a 75% win rate gives you a 0.75^6 .75^6 = 0.177978516, which is almost half of the chance to get a special spin with an 84% chance win rate deck. So saying that 84% is roughly a 3/4 win rate is not accurate.