Is there anything memorable from these decks?
I saw a guy pull it out against me on turn 8, and I was inspired to do something similar. So far, I've only managed to do it on turn 10; the Destroyers weren't coming up. It was a bit of a shock to me that the "original cost" is considered to be the acceleration cost of the card when accelerating, that is, the Seer itself works great as a card for 10.
And all it needed was to add a decent, cost-reducing spellboost card for 9 and an excellent draw card for 7, which is essentially free. I'm playing Medusa more because I can, plus it can theoretically clear out various wards that block the Seer's path to the enemy. I think the Chimera is also okay.
But Mystery is still more stable, yes. Especially with the new teacher, which allows you to cast a Sorcerer on turn 9 if needed.
To sell my soul