Ooooh this is super cool. I take it this doesn't affect duration effects from cards played on previous turns, but it would affect anything Princed?
Correct. It affects the first Action card you play in a turn, one way or the other. If you played no cards in your Action phase, it could even affect a Crown played in your Buy phase, come to think of it.
If you started with the Crown in your hand, then it's always better to play it in your action phase. Edge case that.
Of course it can happen if you hit it with Venture.
I don't know, I think I'd be more likely to crown a Gold than a Chapel or Remake.
So Enchantress, I really like the theme relation to Circe. And maybe the Thor comic series?
The effect seems pretty devastating early on. I feel it's presence makes it more enticing to open double Steward or double Swindler in cases where I might otherwise only open with one, rather than trying to resist the effect by say getting more Silver. It's so important to play key cards that you should be overbuying them against Enchantress rather than getting your only copy of your power card countered.
I feel like Adventures provides good ways to get high action density early to protect against this (plus the events and tokens are unaffected). Stonemason is a great defense too. Looking at Empires, Enchantress seems very powerful against debt cards. Suddenly that early Royal Blacksmith which led to having $8 in debt doesn't sound so good when it can get enchanted on the next shuffle.