Hahaha! Thanks for letting us know about that!
We originally had an issue where the Vicarious Mace would create an infinite loop because of it's own damage growth. We fixed that, but didn't consider the possibility of two of them infinitely buffing each other. Will have a think on how we can fix this. Looks like the mace might have to become a\our first legendary weapon, limited to one card per run.
Thanks again for letting us know, and thank you for playing. Great to hear that you had such a good time with it!