So you need the ability to add a buff to your unit, and that buff adds 1 stat count. As far as I know, you can't have an ability directly modify the attribute count.
Each time you add this buff again, it will increase that by 1.
Have your add stat abilities, (or your add stat dialog) add an additional count of this buff (if you choose to use the dialog, add the buff with a trigger). To add the stats, either with dialog, or with ability, is the same. You can use a variable, but if you do that, you should use a dialog for adding stats. You also do not need to keep track of your skill points with a stat. You can also have a dialog, or anything you'd like. I have three abilities: Add stat 1, add stat 2, add stat 3.Įach ability has the requirement "Have skill points" so you can only use the abilities if you have the skill points.