Just came across this combo in a game. It's pretty straightforward, but I couldn't find any posts about it already, so I figured it'd be worth mentioning.
As noted in A_S00's Fool's Gold article (
http://forum.dominionstrategy.com/index.php?topic=2143.0), FG likes +Buy, +Cards, and trashing.
However, since any buy spent picking up FG enablers is a buy not spent picking up another FG, good Fool's Gold enablers tend to be package deals that do more than one of those things. Also, the fewer non-FG cards in your deck, the greater the chance of your FGs meeting up.
Many of the enablers listed in A_S00's article meet that criteria:
Council Room, Margrave: +Cards, +Buy
Salvager: +Buy, trashing
Masquerade: +Cards, trashing
Spice Merchant: +Cards or +Buy, trashing
Storeroom is another card that helps out FG decks in multiple ways and can be picked up with minimal opportunity cost. It gives both +Buy and +Cards. In the absence of discard attacks, you're guaranteed to be able to pick up two FGs each time you play it. Once you have FGs it helps you sift through your deck to find them, and being able to discard green for money reduces your slowdown once you start greening.
A couple of games that feature this combo:
Evee vs Smoke_Screen:
http://forum.dominionstrategy.com/index.php?topic=9005.msg273551#msg273551Vampyroteuthis vs 2yin:
http://dom.retrobox.eu/?/20130814/log.516d091ae4b082c74d7a96dd.1376495038639.txt#Game OverSome questions:
(1) How does storeroom stack up against the other FG enablers?
(2) Is it worth the opportunity cost to pick up a second storeroom?
(3) What other Dark Ages and Guilds cards should be added to the list of FG enablers?