It will get really confusing when trying to play Action cards as Treasures. For example, if there is a token on Village and you play it in your Buy phase... do you now have actions to play other action cards? It's a mess.
That's the only example I could find that has a natural question that isn't answerable just by reading the cards. It'd be clarified in the rules: extra actions gained during the buy phase are generally useless save for things like Diadem. If you notice other confusing things, let me know, cause I'm wondering if the are any big ones out there.
So you get this token power by buying the card. But the power is rather symmetric -- your opponents will have the same effect on their own copies of that card. It will have no real impact in a mirror matchup.
You can set things up for yourself, like with anything else seemingly symmetrical in the game.
Legends are returned to the supply, and when this is returned to the supply, the tokens get removed. That is a huge disincentive to actually playing the card. That makes the $6 investment even less worthwhile.
The cost might be off there, but it needed to have tension between holding on to the effect and playing it for the big coin benefit. That way, you can abuse the treasure ability, but sooner or later you'll want to play King Midas, allowing someone else a crack at him if they want.
The power issue isn't a big deal to me at the moment; at least, the particular numbers aren't. That's something playtesting can smooth out. For this particular card, I want to know if the idea of Legends as I've written them up is interesting at all, and if the actions into treasure ability is interesting, workable, and understandable.