Turn Back Time will also not work on a unit which has changed shape after the beginning of last turn. (That is to say, at the beginning of last turn you had a stack of Ancient Vampires, and some time either last turn or this turn you converted them to (Ancient Vampire) Bats. TBT will not work on the stack of bats.)
I know that this is the case with both kinds of Vampire, and my supposition--because I've never used either kind of unit--is that it is also the case with the Werewolf and Gobot.
Those four units are the only ones I recall that change their form, but there may be others.
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