The main problem with the upped version being so importable is that it will then be imported mainly into decks as a hard counter to a hard counter. Specifically, Discord/Pestal decks will pack it to block Sanctuary, vastly reducing Sanctuary's value as a hard counter and relegating it to its SoG-substitute role. The problem is worsened by the fact that even if the cost is increased and made mono, Nova/Supernova mesh well with Discord.
I like the idea, but at the moment I don't see how it can be balanced enough to be implemented.