Mulligans
General Mulligans
Keleseth and Crystallizer best keeps. Light's Justice good against aggro (especially Paladins). Happy Ghoul keep only if you have autodamage cards in hand (Crystallizer, Light's justice). Voodoo keep only if you have Happy Ghoul + Autodamage or Happy Ghoul + Lighwarden. Fungal Enchanter can be good to keep if you have Happy Ghoul or Lighwarden.A heal spiteful zoo paladin.
To be realistic, probably a odd version of this could be better.