Mulligans
General Mulligans
Your best opens will come off the coin. If you are able don't play any Divine Shield out till turn 3 (and Coin) to play Lights Sorrow, then start dropping Divine Shied minions. Always throw back Wickerflame Burnbristle and Stormwatcher as these power your Corpsetakers.
Lights Sorrow can get quite large quite fast, so depending on your draw and circumstances, it will usually always be better to not use it till it gets big as it has 4 durability.
It's always a good idea to get Bolvar out asap after the Lights Shadow as losing Divine Shields will buff both.
Playing a Blood Knight out will buff the weapon and Bolivar both, and create a huge target for board removal haha.
Try and save buffs for the Lifesteal as you will be using weapons heavily.
Don't hesitate to play Rallying Blade out solo on turn 3 if you have Lights Shadow in your hand as well. You can use it that turn, and on turn 4 as well, then play Lights Shadow without wasting durability.