So I played a few games with tthe Nocturne cards, and I must say Fool is easily the one I like the least for now. It has the same issue I had with Farmer's Market back then, in that how beneficial it is to you heavily depends on when you get it in hand compared to when your opponents do. Where people defended Farmer's Market under the assumption that you could control when and how often you play it, Fool actively removes your ability to control this by including Lucky coin, which bloats your deck with Silver. There are also so many Boons that do so many different, often non-trivial things, and the luck factor is incredible - especially as there's exactly one Boon that creates an Action and therefore makes Fool nonterminal. And then there's the state, and Will 'o Wisp... It's like a storm of components flying around. And if I look at how much reservation my Spells (which are basically non-random, simpler Boons you can buy) received for being "confusing", then I really don't know what to say.
I admit I really enjoyed playing with Lucky Coin itself, so my hope is that Fool will get established as a very weak card you can usually skip, so I'll just be able to have the Heirloom itself. Of course, with Fool giving a bonus every single turn after it's played until you contest it, it gives a really strong incentive to play the roulette yourself... Which, again, is a problem I had with Gathering cards.
I know this sounds like my Empires rants all over, but I want to stress that I also really enjoyed the other cards. I love Faithful Hound, I had fun buying all too many Devil's Workshops, I loved trashing my Mirror for a Ghost and I also had great fun with Cursed Gold and gaining Ghost Villages using Hermit. Even Druid was perfectly fine, with the randomness happening during setup only (I already wrote that it's quite similar to my Summoner). And buying Estates for 2 VP with Sheperd, and setting aside my Treasures for Crypt, and and and... But Fool has this super random nature that rubs me the wrong way.