That would be a weird obtuse special case rule. Generally those aren't easy to understand, which is why we mostly don't have things like that.
Generally you shouldn't allow your opponent to get that kind of presence on the board. But promote counters are coming soon
My issue (heck, the issue about it in general, I think) is that foiling this is completely different from foiling just about anything else.
Most cards (Hawker Support being a noticeable example) can be foiled both before and after they're powered up. Even if your first hand was unlucky, future rounds may give you one of the cards that can put a stop to them (Scorch, Geralt: Igni, Borkh Three Jackdaws, etc.). Gold cards with 20+, 50+, or even 100+ strength, though? Literally your only option is to destroy them before they're powered up. If you draw an unlucky hand in the same round that your opponent decides to power them up, Adrenaline Rush them, and promote them, the entire match is pretty much lost from the get-go.
I'm glad to hear that promote counters are coming, but maybe you should consider adding a few other options? Take neutral gold cards like Borkh Three Jackdaws and Geralt: Igni as an example. Maybe consider allowing the effects of those to work on all cards instead of just non-gold ones? That may go a long way toward balancing things out in general, especially when it comes to cases of countering promotion-focused decks.
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