Do you already have one of the trios? If you do, you could consider crafting your own boost nodes to find the remaining one's you need. You would just be selecting the first skill you need on the node. This will give you only "good candidates" for the next trio you need - However, it will still be RNG as to what the remaining 2 skills on the boost node will be. Maybe only consider this if you have a lot of extra shards.
If you don't have any perfect trio's yet, it really shouldn't take too many nodes to get at least one though. You don't need to limit yourself to one super specific node, it just needs to contain 3 of the skills you want in any order, and then you can go from there
there is no correlation anymore between the monster and the effect of the familiar. its random. its more about the "rank" of the familiar now, which you can tell based on the color of the outline of the card [greyish = common, blue = rare, etc. going up to unique and legendary] for the better stats u need to rank up ur familiars to the higher ranks
