The nerf to nova is not that big. Honestly, how often do you see 3 novas in a single turn, it is not so common.
About Snova, how about subsequent Snovas giving 24 quanta as the cards says
currently in the trainer if you cast a second Snova it gives 2 quanta for each element except for
About singularity. With its current super power, if you bring one out by accident and can not control it, you have pretty much already lost no matter who your opponent is.
It is unreal that such a little and easy to do mistake makes you pretty much automatically lose.
My suggestion is to "buff" singularity for less ultra-massive-anti-vampiric, really, it is way too much.
And/Or
Make some kind of warning or visual effect in alpha colors (like the ones from Sanctuary and Silence) so when you have used 2 novas/1 Snova, the visual effect appears on your hand and vanishes at the end of the turn.