Having a link value six monster on the field will be huge for your battle.
However, its reliance on specific conditions and the potential difficulty in consistently meeting them may make it less reliable compared to other cards that offer similar benefits, such as Sephylon, the Ultimate Timelord in certain situations, so it may not see widespread play in competitive decks
In fact, Primeval Titan has been the face behind some of the most degenerate decks in Modern, starting with the Cloudpost deck that was prevalent in the initial days of the format, to the Red-Green Valakut deck, and then the Amulet Titan deck both in its degenerate form with Summer Bloom, and the more toned down version we see today with Dryad of the Ilysian Grove and Urzas Saga
Sharp corners, strong centering, clean surface, no visible defects to the naked eye
I believe that the decks did miss by only making the face commander care about the creature type and that, once again, there was a wide expanse between the precons power level and the true power level of the commander