The Gwent Improvements - Ultima is a mod for the game of Gwent in The Witcher 3: The Wild Hunt, which improves the gameplay in many ways. The gameplay is improved by a lot of things, such as:

AI: It is now much more challenging and interesting to play with. It is now much better and is based on your skill.

Cards: A lot of new cards are added, such as the ones that were in the W3 mod.

Textures: The textures of some cards and the backgrounds of the game are changed.

The gameplay is also improved by improvements to the GUI and the user interface.