gameplan: get to 12 power, play Mournfull Deathcap and
A New Tomorrow , next turn play
Solitude
or: get to 14 power, play 2 deathcaps and A New Tomorrow.
To get to 12 or 14 power you use mask.
In your opening hand you're usually looking for 3-4 power and a merchant, power is more important than the merchant. Your first merchant should get mask most of the time, your second can get A New Tomorrow. Get
Adjudicator's Gavel if you're up against a reanimator deck, or
Disjunction if they have destroyed your mask.
If possible, you should wait with the combo until they don't have power, or you're sure that they don't have a fast spell that can kill your deathcap. If you don't have solitude yet when you play the combo, you can use the crest of A New Tomorrow to search for a merchant.
This is stil a work in progress, so any advice is welcome.