hmm this is tricky because Elementalist are really hit and miss and they generally need specific things to actually be a threat; It's not that they are bad just that it takes a lot more effort to make this work as well as RNG in your favor as well as a lot of other things like what your opponents are running.
Personally I do run it occasionally because I run Demons often and I like the Synergy between spellcasters. I have won games after getting Golem for sure but tbh I felt like I probably would've won because of how Demons function overall, and also I had Brand with Morello's and a Kennen wit morellos and with Demon trait from spatula.
That's like best case scenario to me, a lot of things had to happen for that to work and honestly the elementals were just the icing cause I was already winning with a Demon Ranger Sorc but i couldn't get a lv 2 ashe so i bailed on it when i got a lv 2 brand.
Golem itself is a great tank and solid damage but I feel like there is a reason for this and it's pretty balanced relatively speaking. Running Elementals is such a limited restricted thing, there isn't a lot of synergy with a lot of other things but basically they are splashable in a few other things but don't have a lot on their own and the Golem is like Captain Planet for them (for ppl who know how their powers combined to form the Capt) but on their own it's like meh they aren't great.
If anything I'd say most of them on their own need some sort of tweak cause their costs are way too high as well as in the case of Lissandra just too dam slow and not worth investing Tears or whateva; especially when you compare her effect to Sejuani who's is better and she is at least a Knight so has some synergy with some semi-strong class and being glacial obv she is a great pick with a Ashe and way better than Lissandra.
Brand is fine
Kennen is in a weird place
Anivia is absolutely shit unless you already have like Morello's and Tear for her
So basically they have 1 1/2 functioning champs so they should probably have a decent Active considering you are trying to get 3 of these shitty guys.
Needing 3 of 4 Elementalist (forget about anivia cause you ain't gettin her and if you do i promise you will be disappointed) for anything other than a gamebreaking or at least possible gamebreaking effect would be a waste of a class