How to make an unit casting custom abilities

[n0th1nG]

I am currently making a passive ability that when a unit cast a spell, it have 20% to replenish 175 mana. I dont know what to do when it comes to replenish the mana. I've tried creating a dummy to cast Replenish but i can't find it at Unit - Issue Order Targeting A Unit . Any suggestion

 

[Chaosy]

Overly complicated. Just trigger the mana granting instead

 

[n0th1nG]

Overly complicated. Just trigger the mana granting instead

Oh yea i totally forget about it, thanks