Its meant to be aimed at immolation / cremation as well...
Right now, the double edge nature is meant as a balancing mechanism. I'm a little worried that taking it out of the upped version would make it OP. If the consensus is that this isn't a problem, I can certainly do so.
Note that the silence effect, even if it were 100% chance, would still allow nova or cremation to be used for powering creature and permanent abilities, they just cant be used to power a rapid succession of spells in a single one turn blitz (e.g. rainbow rush tactics).
What if the wording is changed to:
"Quanta created before the end of turn may silence the owner. Autocasts for free if a quanta-producing spell is used."
That would interfere with towers and upped pendulums as well... Hunting false gods would be interesting.