I was trying to come up with a build to take advantage of the displacement dragonmark. I came up with the elven shadowblade on the fighter forums:

http://forums.ddo.com/showthread.php?t=116302

If you added a level of caster in you could double your displacement time for "free."

It could work on any dps strength build but the dragonmark feats hurt a little more on a non fighter.