Dexter Ambidextrous

This deck is built to maximize Dexter's free fast action of replacing an asset each turn. If Showmanship is out (+2 on skills for new assets that turn) he can accomplished a lot with items like Colt Vest Pocket, Liquid Courage, & of course all of his spell assets. Even Ritual Candles works with the +2 bonus.

By taking Scavenging via both copies of Versatile & focusing on willpower-based Investigating actions, he should have a pretty steady flow of recycled items from his discard. This also means Scroll of Prophecies is less costly since you will easily recycle any of the items you might discard from the draw. The 6 neutral skills with card draws are important to mitigate a bloated/slow deck from the extra 10 cards.

The build is reinforced with Crystallizer of Dreams, which is both cheap to play, as well as simple to use with his fast-action discard (especially when its bonded monster is in the way). With 2 copies of that in rotation through your discard pile recycling mechanic, he should get a lot of leverage by reusing the 10 Event cards as bonus skills cards.