"The problem with having clan specific mission cards is that it massively inflates the price of the relevant cards"
The solution is to have solid collection of relevant cards from each clan before LD. That way you avoid the inflation almost completely. Relevant cards rarely cost meaningful amount of clintz, so it is accessible to anyone who looks a little ahead; list of LD order is out there. You can make most missions just using 2 cards from clan, tho it will take time.
Also UR is very sensible these days picking the mission objectives. Last mission-specific card was Ivy
- costing "whopping" 300cz when inflated. Also they pick such mission objectives there is always relatively cheap alternative out there. No trouble here either.
If you are not collecting certain clans aka have cards at all - then you wont need that clans LD either. You are not collecting the clan.
Total noobs miss opportunity for week to few months because lack of cards and clintz. Well. Bad luck. Next roll is in half year for that clan.
If new player commits to this game even semi-actively he 100% sure will have full LD collection in one year, even if he misses current and next few LD's totally.
This is "Want it now but cant have" kind of trouble that is not actually trouble at all.