Mulligans
General Mulligans
best early card is Cleric and if you get Cleric + extra arms then you might consider casting the quest spell on a later turn like 3 or 4.
the idea is that with High Priest Amet on board and Sand Drudge with low cost spells and Wrapped Golem you can hide the new legendary behind 1/7 taunts and force a hard removal, then you can proceed with Grave Horror and buffing them with your new OP hero power combined with Embalming Ritual and Seance for the horrors.