With how the damage is allocated, and only the reanimates having regeneration, it feels like a more or less meaningless ability without an impact.
Often, enough damage is dealt to the fragile reanimates to remove entire trays and when a few spots are open, it still relies on the runes which doesn't pop up very often. And why doesn't archers also have regeneration??
I don't see how it would ever have an impact, other then VERY situational and rare occasions.