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Mulliganing
How often should you try to find payoff cards? Or maybe a bunch of mana dorks and Bowmasters are enough? One landers with mana dorks, value-orienrted Grist hands, etc. Try to write down basic rules of mulliganing for Yawgmoth.
This deck mulligans very well; a six card hand with a path to Yawgmoth is often better than a seven card hand without one. Yawgmoth generates enough card advantage to make up for beginning the game with down a card or two. Additionally, Yawgmoth-based hands are going to be good against a wide range of matchups, where Grist- or Cauldron-based hands often struggle against linear combo or big mana decks. 
Always take full advantage of all of the pregame information available. A companion on your opponent’s side narrows down the possible decks you a...