What about keeping the cost the same (or higher maybe) and bringing back the mitosword idea that we could do in the trainer before? It can't be too much faster than Fire, and Life has no active control as a mono anyway.
That was one of the combinations that was deemed the most "broken" from when it was first released. After people started showing evidence of 4 turn wins against FGs being more commonly possible than not, its fate was pretty much sealed.
However, I would LOVE to see this mechanic added again to make Flying/Animated Weapons target-able again. If there was a clause that assigned Other cards a certain amount of
quanta as a cost when targeted by Mitosis, I'm pretty sure that would stop the aforementioned combo from being abused. But I'm fairly certain that would require some amount of coding magic to make possible.