Sure, you can keep making Cat tokens over and over again, but if you have tokens of another artifact or a different powerful creature, you can quickly make an army of massive creatures
Django Wexler (October 23, 2019), The Gathering Storm, Chapter Twenty, Del Rey
And you draw for each one even if they died at the same time
Wizards may hold off on printing more until subsequent visits to Bloomburrow
To determine a spell's total cost, start with the mana cost (or an alternative cost if another card's effect allows you to pay one instead), add any cost increases (such as kicker), then apply any cost reductions
Kaya played a pivotal role in the War of the Spark