Chron-Illogical, a card-and-dice trip through history

Hi all...

By way of introduction, I'm Jeff, 32/M/PA.  I'm posting here today to get some feedback on the use of costs and
victory points in a game I'm kicking around right now.  I'm pre-beta here, still working bugs out of cards'
abilities, how the set will be made, etc.  You know...the fun part!

My game is called, for now, "Chron-Illogical" (though, to be honest, I'm not entirely in love with that
name).  Players take on the role of museum curators who have access to a time machine, whereby they take
Exhibits from the past and bring them to their Halls, in the name of scoring the most victory points after
five such Exhibition Rounds.  The catch is that the machine can "flux" causing the exhibits to be destroyed
before a single visitor comes up to the velvet ropes.  The design is card-and-dice, with each player
rolling 5d6 for resource points (used to play cards) each turn, and contributing their d6 also to a
"Paradox," the common, shared die pool that will eventually be rolled to see what Flux will destroy
exhibits in play.  The cards themselves follow a "Dvorak" aesthetic: they'r
 e either Things or Actions, essentially.

The game's internal logic obviously creates some weird juxtopositions, and that's most definitely by
design.  Who wouldn't want to see Freud and Jack the Ripper in the same room at the same time?  That said, each
card (with the exception of the time machine cards) has an actual historical reference, with at the least a
year or era associated with the card on it.

Now here's my question.

All cards have a cost, in "years," to play them.  "Years" are taken from a once-per-turn roll of 1-5 d6 and
players' max is 30 years at a time.  Alternatively, the bigger, more powerful cards also have the cost of no
years, but rather sacrificing a d6 to the Paradox pool to bring this heavy-hitter out.

My question is this: to keep stat-lines for cards clean, is it advisable to have costs equal victory points? 
Would a simple forumla help, something like "Cost-times-2" or similar work?  If we link costs and victory
points, how do you assign a worth to those cards that use a d6 chip-in as their payment?