What's your budget for the deck?

Twilight Drover is a good card for token decks and works quite well with Ghave. Requiem Angel would also be decent.

I don't really have a budget for it, but I've spent a lot of money on EDH already.

I must have missed Twilight Drover , I was only looking at cards that generated saproling tokens. I may have to seek one out!

One card I highly recommend is Glare of Subdual because with a lot of creatures in play you basically control the board, allowing attacks to get through ect. You might also like Collective Blessing Increasing Devotion maybe Conqueror's Pledge and Phyrexian Arena never hurt. I also think Death Mutation may be too high cost. +1 from me.

Thanks for the suggestions! I added Glare of Subdual , it's perfect for this deck. I'll look into Phyrexian Arena , could definitely use more card draw to keep my deck moving. Collective Blessing was in an earlier iteration but I removed it in favour of Beastmaster Ascension for obvious reasons. As for Increasing Devotion and Conqueror's Pledge , I wanted to stick with the saproling theme, so I omitted them.