Has the reverse Embargo ever been conceived?
Minister - $2 Action
Trash this card. Put your Minister token on top of a Supply pile. - When you buy a card from that pile, +1 VP.
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Setup: Every player gets a different Minister token.
So basically you can just pick a pile with cards that you'll buy a bunch off and get an extra 4 or 5 VP from buying those cards (if you split them evenly). Only you get the VP token, but other players can choose the same pile and get their own tokens.
I think it can provide interesting strategic decisions like Embargo does. You sacrifice some early cash to set up a longer game plan. And of course if your opponent sees you uhm... Ministering Spies, he can fight the split, but for no gain of his own until he gets his own token on it.
The way it's worded right now, you could buy and play another Minister to move your token to a different pile, but that's okay, I think.
Thoughts?
This seems like a missed opportunity for a non-attack interaction. I think there should be one marker that works for everybody. It's still better for you than it is for other players because you can choose to put it on whatever you were going to buy that turn anyway. If you built a deck of Markets and have 6 buys near the endgame, you could slap this on Copper and rake in the points.
If you do decide to make it a global marker, I have more advice. I tried to create my own Embargo-like card with a single marker and although it's not currently in my set, I learned a few things about it from feedback and testing. The big thing is, since there's only one marker and it's not cumulative, the card really shouldn't be a one-shot. Also, it should really give some resources or you're benefitting your opponents more than yourself.
MinisterTypes: Action
Cost: $3 or $4
+1 Buy. +$2. You may move the minister token to any Supply pile.
When a player buys a card, he gets +1 VP if the minister token is on that pile.
Setup: Put the minister token on the Curse pile.