I know this will probably not be one easily found: but the entire Feng Shui game system is set against the backdrop of a war across time.
The biggest principal in Feng Shui time travel is that individuals barely matter. You can go back in time, kill off your great-great-great-grandfather, only to discover that you are still there, because your g-g-g-gramma married some other guy, still had a boy who strongly resembles your g-g-grandad, who still met and married your g-g-gramma, etc.
What changes history is actually control over specific locations and structures. Anyone who has control over these key feng shui sites (see where it gets it's name?) controls the flow of chi, positive energy, which provides all manner of good fortune and prosperity.
SO for an example: go back in time, get your grandad hitched to the richest girl in the world. travel forewards in time and you'll find the fortune gone and nothing special about your life aside from a few nice (but worthless) antiques you inherited.
Conversely, travel back in time, and hitch your grandad up with a feng shui site, and make sure it's adequitely protected... Step foreward and find your situation in life greatly improved, possibly grandpa left that site to you when he passed on. suddenly, your life has improved fourtyfold.
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In Feng Shui, time travel is done by traveling through the timeless Netherworld, which is a palce between places, and a time out of time... as such, there are portals to the netherworld that open and close periodicly in four major junctures: 69 AD, 1850 AD, the contemporary era, and 2056 AD. The netherworld itself is a special place, it acts as a dumping ground for people, places and things that have been erased during revisions of history. If you can find a TV in the netherworld (which is unlikely, most TV's that are there are cobbled-together from other, more questionable devices, like the Apple Mona (followup to the Lisa), you'll find that the airwaves are alive with Netherworld TV, between reruns of My Mother The Car (it's a brilliant series actually.), they run news of recent revisions to history that may have gone unnoticed by the majority of the population. The netherworld itsels if almost run by four monarchs... four all-powerful arch-sorcerous rulers whose history was so thuroughly erased from the timeline by forces that opposed them, that their entire planet-spanning empire makes up a good chunk of the netherworld.
Once you've found a portal to the past, you can change history, either by aquiring Feng Shui sites, preventing other people from aquiring them, or by destroying them, and a lot of mooks along the way.