Since many people seem to be posting card ideas today, here's something...
The concept is that these cards use a shared token system, giving them a natural synergy. I am sure that there are many different things you could do with such a system; these are just a few ideas. I haven't play-tested them (don't have a regular group to play with) but would love feedback and suggestions.
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Relic -- Treasure
Cost: $5
$1. +1 Relic token. When you play this, you may give up any number of Relic tokens for +$1 each.
Details: Relic is always worth $2 if desired, since it provides a Relic token when played. Its main power comes from the flexibility provided via the tokens; you can save up coin for the future. The power is compounded if there are other cards around that use Relic tokens.
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Abbot -- Action
Cost: $4
+1 Relic token.
Trash a card from your hand. Gain Relic tokens equal to half its cost in coins, rounded down.
When this is in the Kingdom, at the start of your turn you may give up any number of Relic tokens. +1 Card for each token given up.
Details: This card introduces a persistent effect that all players may use so long as you have Relic tokens available. The card drawing power does not cost an action. I think this may be buggy with Black Market!
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Abbey -- Action
Cost: $6
Choose one: Trash any number of your cards from your hand and gain that number of Relic tokens; or give up any number of Relic tokens and choose one for each token lost (you may choose the same thing multiple times): +2 Cards, +2 Actions, +1 Buy, +$2.
Details: This is probably too powerful due to the massive flexibility, but it is offset (at least on its own) by the heavy cost of gaining those tokens. It does function as a super-chapel in this manner, but you can't buy it as an opener so it's not as effect a deck-thinner. Also... lots of AP, probably.
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I originally had an alternate VP card named "Reliquary" that was almost identical to the recently posted
Tower card. But thinking more on it, I don't think such a card would play well with a shared token mat.
Having such a VP card disincentivizes using the tokens for bonuses with the other cards. Similarly, having the other cards available to gain even more tokens discourages a player from trying to end the game as opposed to accumulating more and more points.
Any suggestions on another way to do token-based VP?