On which settings do you play your new mictlan game ?
A few additional things to my basic GK cause i see that my wording wasn't very clear

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I meant that before trying to cast forge of ancients you should get 10-15 hammers asap by building them yourself and by trading .
Then on around turn 40-50 depending on your earthincome you can decide whether you try to bring up forge or not .
With Mictlan this is especially nice cause every B2something mage can then instantly forge bloodstones .
By turn 40-50 your bloodincome / turn should be at least about 150-200 slaves / turn . Iirc 1 bloodstone with forge upcosts 2 earthgems + 10 slaves . So basically the turn you bring up the forge you should be able to forge about 30-40 bloodstones . Then you just hoard them like crazy and for your enemies dispelling forge is not cost effective anymore .
At turn 60-80 ( depending on your gemfinding luck etc. ) you are unstoppable and win the game .
On any map with 200+ provinces and "normal" settings with 50% site frequency + normal research this works quite well . In my Last mictlan game i had by about turn 75 something like 400 bloodstones , 300 clams and 200 fetishes . I had there a "suboptimal" vq and not a gk

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Forge of Ancients + a Blood nation is imo almost unbalanced though . And construction + blood are basicly the 2 most important schools for Blood nations anyway .