I am LLL.maDe, legend player ever since legend came into existence with multiple top 100 finishes (rank 23 of april 2015).
After trying out a lot of new stuff on the ladder the last couple of days I decided to just get legend and build a new secret paladin. I went from rank 5 to legend with a 30-6 record. And after that I climbed to top 3 with it.
winrate + classes: https://gyazo.com/bbd2263f2f104f6645edf77a47da9e45
top 3 legend: https://gyazo.com/4b8e37393c5bbf08f99c608d6180b4c4
EDIT: made it to top100 at the end of the december 2015 season with this deck!
Because of the great interest shown in the deck and the many request to write a small guide, well... here it is :D
The deck is all about board control. One of the key cards in the deck is Keeper of Uldaman. The card alows you to very often make favorable trades, deal with their big minions or buff your small dude out of range for death's bite, consecration, holy nova etc. It gives the deck a lot more utility then the traditional secret paladin.
All in all there is not much more to say I don't think. Just always think a few turns ahead, think about what your opponents options are for the following turn(s) and figure out the play that makes their life as miserable as possible.
First of all I'd like to say that I don't really have set rules for mulligans tbh. What I usually do is I wait for my opponent to mulligan and then start thinking about what cards he's likely to have or not have and then start thinking about turn 1/2/3 and maybe 4 and what they should look like and which of my cards would be benificial for those turns.
However for the sake of the guide I'll give you guys some guidelines
Druid: Mysterious Challenger (if you have coin and they mulligan a lot of their cards)
Rogue: Truesilver Champion (only with coin)
Warrior: Mysterious Challenger(if you have coin)
All the info I have on the matchups is in the screenshot above this guide on my stat tracker (check the v1.10 results as that is this deck)
Have fun with it and if you have any questions just leave a message below and don't forget to follow me on social media ^^