Its got to be notable
Like most Magic: The Gathering cards, the value of Season of Gathering depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Bloomburrow)
My problems with it are that it has a high mana value, so that upkeep trigger wont always be all that impactful, and the activated ability also hits your own creatures
Creatures that enter attacking are never declared as attackers, and as such, they won't cause Dollmaker's Shop's ability to trigger
In the end, you'll be prepped to craft a collection to play MTG: Arena for years to come
If you have a choice between making political choice that ruins something crazy from happening and not doing that, stick with the latter