problem with "replace unit" action

problem with "replace unit" action

hi
I just started to create my own spells - so I´m new to spellmaking. my first project: the werewolf
I tried a night and day feature... (if it is night he automatically moves into the wolf-form)

I tried out
Event: "ingame time becomes 18.00"
Condition: none
Action:"replace unit with other unit (the wolf-form)"

So far it works... to switch them again i set
Event: "ingame time becomes 6.00"
Condition: none
Action:"replace unit with other unit (the normal form)"

I had to place the Normal hero form AND the wolf-form in the map to choose them as unit i want to replace. So i have 2 heros at the same time and if it becomes night the 1. one becomes wolf form and if it becomes day again the wolf-form hero, i placed in the map, changes to normal form.
I just want 1 hero who morphes to wolf form and back agint without loosing skilled spells, items, life points and so on...
omg plz help me

You can always give the unit Metamorphosis and make him use it to transform into the Wolf Form. The duration would have to be as long as the time you want. Remember to remove the ability though.

ok thats another posibility, but now i have to manually cast the spell. Would be better if the unit automatically morphs into the other form like a passive effect.
How can i make the werwolf triggering unit without casting the spell manually?