Hello there!

I set up a Warrior with my own script since a lot of people asked for it, letting him fight in arena and concede until he gets back to rank 20.
The winrate is seen here: http://hss.io/d/2278501
Of course you don't see 88%, but since he concedes 4 times in a row and needs 4 wins to get to rank 19, the maximum amount of win rate is 50% and the deck goes up to 44% (44%*2=88%)
Until I upload my script, use the normal "rush" one, I got up to 41% using it.

Deck List:

The deck is built around for the bot to take up board advantage by clearing with the weapon and shaded minions, meanwhile he damages the enemy hero from time to time and kills him in 1 turn, most likely with a weapon dealing 12-13 damage in 1 hit and a charge minion.