1K APM Dexter

Simple, but effective is the main idea here. You can see a lot of XP, but 8 of those is free from upgrading spells per scenario. You can upgrade other spells later in the campaign aswell. Also 4xp Geas is rather a cherry on the cake. You won't commit cards a lot in this deck, so this card is good, but you don't need it.

The best setup here for hand and arcane slots are Cyclopean Hammer, Sixth Sense and Haste. The other spell (Rite of Seeking) is a backup plan. The more, the better. Using Haste you can almost every turn get that extra action, because fighting and investigating counts as "activating".

Molly Maxwell can very easily tutor stuff for you. You don't have a weapon? Say "relic". No way of getting clues? Say "spell". Maybe you want Haste, just say "ritual", etc. Backpacks are mostly for more reliable Cyclopean Hammer draws.

That's a lot of resources, but you have Bank Job, David Renfield and Emergency Cache which you can even find with Backpacks

You don't need to start with Leo De Luca in your deck. You can pick them up while getting Charisma. Only one Charisma is fine, since Arcane Initiate, David Renfield and Molly Maxwell are always a bit temorary allies and it's easy to discard them playing Dexter.