While he can certainly perform admirably within the context of this precon, I believe that youll probably get more mileage out of this deck by replacing Szarekh, the Silent King with one of the other commanders if you plan to upgrade this deck to play in higher power tables
Golgari insects was already a well-supported Commander archetype led by Grist, the Hunger Tide and Zask, Skittering Swarmlord, so Seedship Broodtender would be right at home in those decks
On the whole, creatures are low-power and high-toughness, making board stalls very common
That being said, at just three mana, Tezzeret, Cruel Captain may be cheap enough so that incremental value over the course of a few turns may be powerful enough
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