I thought about the cost aspects for a while and you are all right, it was too high.
I was comparing it to antimatter initially, but rage potion is certainly a better reference for the costs due to the Z limitation.
Even if it is similar, I wouldn't say it is a weaker version of rage potion, because of the switching it can be used in quite different, also defensive scenarios.
(I didn't think about protection against paradox, but yeah, good idea, that would work too
)
I would prefer to not increase the Z factor, I think it's easier to keep it with these limits to prevent possibly unbalancing.
So basically.. I changed the costs to 3 (2)
as requested, hope that's better.
Thanks for your feedback guys.