Vlad
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If the rules for your mod align with the final version, I think it will add variety to the game.
However, you will need a lot of help for such a project. After all, creating a faction with 14 creatures + a hero requires 6 animations for each creature...
You will also need to develop a certain number of skills. Half of them already exist, but the other half will have to be written from scratch... And you will also need to come up with a skill system.
This will take a lot of time. If you have any existing work, please share it, and we can take a look. Otherwise, your idea might not be suitable for Heroes V from the start.