So I've bought most of the expansions, including Miskatonic Horror, and am working on integrating the new cards as much as possible into the other sets.
I understand how most of the multi-expansion cards work, as in why they need both marked expansions. This makes sense for cards that require the geography of one expansion but a game mechanic from another, or combine new mechanics from 2 different expansions.
But I here's what I don't understand. MH contains 8 new encounter cards for each area in Innsmouth, with a golden anchor symbol on them. But it also contains an additional 2 encounter cards for each Innsmouth area which have the anchor AND the Lurker at the Threshold mage symbol. So by the general explanation from the MH rules insert, you would only include those if you are playing a game with both the Innsmouth and Lurker expansions.
But the Lurker set actually contains several mechanics, which can be introduced piecemeal - such as the Lurker herald, the alternate gate markers, the Mythos cards with gate bursts, and the various new investigator cards (including Relationships). Which aspect(s) of LatT should one be using in order to warrant inclusion of the double-marked (IH & LatT) encounter cards? Are these cards to be added specifically if one is playing with the LatT herald card? (There is nothing on these cards that requires a LatT mechanic, and many of the encounters duplicate existing ones).
I presume they are there to somehow balance the encounters. The main thing I'm wondering is, is there any reason for me not to just include them as if they were simply Innsmouth cards? Or should I keep them out unless playing with the LatT herald?
Any insight is appreciated.