At the beginning of your end step, if a permanent you controlled left the battlefield this turn, put a +1/+1 counter on target creature you control
The deck is so rigidly built around these mechanics that it feels hard to identify just one or two big upgrades to improve its power, and instead, you would need to chop and change a considerable chunk of the deck to make meaningful improvements
This is a big topic so we will skip over tokens, which are permanents, but not cards, we've got a lot of ground to cover, so lets get started
Prosper, Tome-Bound decks can play fairly or enable busted combo turns thanks to the mana production coupled with all that delightful card draw
The panel mentioned that there are additional ways that this can be obtained, but the exact details haven't been revealed yet
5 Sphere Grid Is An Effective Way To Buff Your Creatures A Cheap Alternative To Increase The Potential Of Weaker Cards While a +1/+1 enchantment is nothing new for green, enchantments like Sphere Grid are still an excellent asset to have on the board for any compatible commander deck