How to trigger a healing ability at the cost of casters health?

[SenPie69]

HI everyone, new member here but a subscriber last year ( i just didnt create an acc before lol )

I have some experience of using triggers but i find this confusing and hard
EX: ability Holy Light and instead of mana cost, it will use the health of the caster to heal/damage target unit~

 

[Warseeker]

• Holy Light
  • Events
    • Unit - A unit Starts the effect of an ability
  • Conditions
    • (Ability being cast) Equal to Holy Light
  • Actions
    • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      • If - Conditions
        • ((Target unit of ability being cast) belongs to an ally of (Owner of (Casting unit))) Equal to TRUE
      • Then - Actions
        • Unit - Set life of (Casting unit) to ((Life of (Casting unit)) - (200.00 x (Real((Level of Holy Light for (Casting unit))))))
      • Else - Actions
        • Unit - Set life of (Casting unit) to ((Life of (Casting unit)) - (100.00 x (Real((Level of Holy Light for (Casting unit))))))