LuxuryBall Deckling

Kitties! For your planeswalker, I would suggest either 2 of Ajani, Adversary of Tyrants for that ultimate ability getting more lifelink kitties out, or 2 of Ajani, Wise Counselor for the lifegain ability. Or you could just do 2 of both!

Yeah Blinding Fog could be pretty nice for a protection. I wanna see how it fairs up against a deck that actually has Goblin Chainwhirler in it. Well, actually I remember facing my friend's new aggro red deck that had a Chainwhirler in it. I messed up and paid the wrong mana during Driven // Despair and couldn't get my Sporecrown Thallid out before he Chainwhirler'ed next turn. So I imagine that just getting those out correctly could be the counter to field wipe, but I'd like to see more play test against it before sliding Blinding Fog in.

Taking a closer look at your deck, I've noticed a couple things that you could change. From comparing my saproling deck, Sappy Bois, and the one here, yours is about creating and sacrificing the little bois, while mine is creating, buffing, and using the bois to win. That said, I think you could take out the 3 Sporecrown Thallids and replace them with more sappy boi generation. I would recommend 1 more of each in their place: Spore Swarm, Saproling Migration, and Yavimaya Sapherd

This can take away emphasis of buffing the things you're just gonna sac, to creating more of the fodder to sac

TheTrueSchmamook Thanks for the advice! There's already a few cards in place to address some draw power. Driven is a nice 2 drop that can really ramp your draw in a turn, along with hitting face for a few points. Enter the Unknown can get you that explore to more or less scry, plus played with an additional land in hand gets you that mana advantage very early. If you need more draw power, you can go ahead and sideboard in the Fungal Plots. With Slimefoot, the Stowaway out on the field, your draw will also do a bit extra.

Root Snare is a nice idea to protect against Goblin Chainwhirler, but unfortunately it won't work, seeing as how it's protection again COMBAT damage. Chainwhirler's ETB ability isn't combat damage. A few ways around it is to either Harsh Scrutiny the chainwhirler, or just have one of your lords out to beef your sappy bois.

Gruesome Fate on the other hand, I like that idea. I'm gonna try to find a spot to fit 2 in and see how it runs.

I like your Sacroling deck quite a bit, but I can see the differences between yours and mine. Yours is about generating and using them for bigger things while mine is just flooding the field with all the little bois and manipulating with them. It would be very interesting to see the two fight each other hahah.