I had a bizarre dream last night in which I received a copy of Dominion: Allies and was trying to figure out how to play it. In my dream, the "Allies" were minor effects kind of like the Boons (e.g. +1 Card), but I wasn't sure what caused them to trigger. I couldn't find anything in the rules, so I asked this guy who was there, and he said, "Oh, you get the allies when nothing else in the game is happening. So like, when you play a Horse, and then you return it to the Horse pile, that might be a good time to use an ally."
And I was like, "So there's no hard and fast rule, it's just whenever you want?"
And he was like, "Yeah, basically. Just whenever there isn't anything else going on."
So I was obviously appalled that the notion of deterministic rules had been completely abandoned, and I tried harder to find further explanation of how the allies worked, but then because it was a dream everything just moved on and I forgot about it.
So anyway, I really hope that when this expansion comes out, all of the cards actually have rules about how they work!