Is there anyway to make +1/2/3/4 hp per str spell ?

Is there anyway to make +1/2/3/4 hp per str spell ?

Is there anyway to make +1/2/3/4 hp per str spell ?
whenever your str is changed

If youre trying to say that if u activate a spell it willadd 1/2/3/4 health depending on the strengght of hero?

Events
    Unit - A unit Finishes casting an ability
Conditions
    (Ability being cast) Equal to [ability you want]
Actions
    Unit - Set life of (Triggering unit) to ((Life of (Triggering unit)) + ((1.00 x (Real((Level of (Ability being cast) for (Triggering unit))))) x (Real((Strength of (Triggering unit) (Include bonuses))))))

You need to make a real varible called ehaterver u want. This meathod will revert it to the ORIGNALE HEALTH of the unit when he/she CASTED THE ABILITY
hopefully this is what you want
Set [varible name] = (Life of (Triggering unit))

No it's a passive skill.
I don't know how to check when the str is changed.

Whenever he gains a level or gets/drops an item, his health should be increased by 1/2/3/4 per str if he has learned this passive skill.