Ignoring Empires since I haven't played with it and there's still 10 sets without it.
Let me start with a kingdom including my favorite card from every set:
Throne Room
Minion
Salvager
Golem
Counting House
Jester
Highway
Feodum
Herald
Haunted Woods
So there's definitely an engine there. A Highway megaturn seems very unlikely, since Salvager is the only +Buy, gaining is limited to Jester, and the splitters are all strong but somewhat unreliable in some way or another. A regular engine based on Minion seems like the way to go. Throne is probably the best splitter here, you probably want to be careful with autoplaying Salvager with Herald, and Minion is a very solid Throne target. Once you've trashed down a bit and can handle the terminal space, you might add a couple of Haunted Woods for extra reliability; early on, it might conflict with Minions, both because of the handsize thing and because it's the same cost and you really want to win the split. Adding a single Jester seems good. Counting House, Golem and Feodum look forgettable, sadly. Even Herald is not the rock star it usually is. My favorite cards do not seem to play very nicely together.
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Next up, a kingdom from the Face of Dominion topic (
http://forum.dominionstrategy.com/index.php?topic=15179.0), involving a representative from every set:
Smithy
Nobles
Lighthouse
Alchemist
King's Court
Horn of Plenty
Noble Brigand
Rats
Merchant Guild
Peasant
The only trashing is Rats, which you shouldn't buy of course, but there's still an engine here. If there's King's Court, there's a way. Alchemist might be very good here, since it really adds reliability, and it's a very spammable card that would love a token from Peasant. You can go two routes here, a Merchant Guild deck or a Horn of Plenty megaturn. The latter option seems stronger at first glance, with King's Court support it seems simple enough to get 8 uniques in play. I'm assuming no Colonies here, there's only 1 Prosperity card. Nobles can be useful because it adds some village support if needed. Smithy seems ignorable, and Noble Brigand can't steal Horns so it's also lackluster, since you won't have that many Golds and Silvers, just enough to hit King's Court a couple of times. Lighthouse is only useful if your opponent somehow does go Brigand, but even then it's probably not necessary.