I got to legend rank with this deck on October 28th, 2017.

I spent about the first two weeks of October exclusively playing Tempo Mage to get to Rank 5, then switched to this Big Priest decklist to climb from Rank 5 to Legend. A homie of mine turned me on to the Big Priest archetype and gave me some coaching, and I put my own spin on it with Soggoth the Slitherer. The idea was to have an extra BIG minion in the deck so that when you Shadow Essence or Y'Shaarj, Rage Unbound you have a better chance to get something good instead of Barnes. I also threw in a Mind Vision, as it helped spice up the deck to make memorable games. Mind Visioning Deathstalker Rexxar, and Eternal Servitude'ing a particularly nasty Zombeast comes to mind.

I play almost 100% of my games on mobile, so without Deck Tracker and my memory admittedly not being the greatest, especially after playing 10+ games in a session, starting at rank 3 I started using a pen & paper cheat sheet.

This "Scantron" type form helped me especially during long games to keep track which minions I had drawn, and which friendly minions had died to help me keep track of what is left in my deck and to make sure something died to resurrect with Eternal Servitude.