There are many cards that are considered must haves for some classes (e.g. higher education and Dr. Milan Christopher for seeker, machete for guardian and so forth; you catch my drift).
So here is what i want to know:
Have you built any decks that worked without must haves and still worked great? And which cards were you using as substitutes?
I have built a Pater Mateo deck with neither Rite of Seeking nor Ward of Protection. Both cards are often described as a given in mystic decks. I included seal of the elder sign as a replacement for Ward of Protection and Scrying lvl 3 as a replacement for Rite of seeking. Rex renounces higher education because magnifying glasses are enough, Ashcan Pete hasn't bought any of his 5 "wild" cards (he is our most reliable fighter with his ornate bow) and Roland leans more toward finding clues and horror mitigation.
Walking the path to carcosa with 2-3 fellow investigators (Ashcan Pete, Rex Murphy, Roland Banks) has been very tense some games but our journey this far has been in the middle of the difficulty scale (not getting all victory points, but always resolving a good resolution) playing normal difficulty.
We are very happy with how this campaign is playing so far and I enjoy very much that we're moving outside the "this has to be in your deck!!!11"-boundaries.