Budget Demonlock

 Stall the game with all your spells that do damage and get value through Stonehill Defender and Marin 

Heal yourself with the healing spells and minions  when necessary

Try to get the skull out as soon as possible when you are facing another Control deck

Against aggro only Play the skull when you have voidlord in Hand and board Control

Your least favorable matchup is priest so you have to take risks against them

Against all other decks you have a fair Chance if you have the luck of the draw