Hero Ability, need help

Hero Ability, need help

I'm trying to make an ability so that when the hero (the one with the ability) kills a unit, his maxium mana will be increased by 2 and so on.

I can't seem to find an ability that does that and i have tried triggers. The only thing i could find was set mana value or percent.

Is this possible? If so, can someone please assist me in making this ability or point me in the direction i need to be.

-Thanks

base an ability off the item ability that gives permanent mana. u will need many many levels

There is no easier way? If there is no easier way i guess i could put a limit on it.

try this:
http://www.wc3campaigns.net/showthread.php?t=80490

it is a JASS system by Blade.dk.