The Greenmod is a silly little set of jokers focused around the new enhancement, Green, which seems useless at first, but unlocks powerful effects from various jokers, including permanently upgrading your cards in various ways.
The balance of the mod shoud be vanilla-esque, unless it turns out I'm terrible at balancing things lmao
The mod can be found at: https://github.com/Icyhuman/balatro-greenmod