Or you can make one Trigger and For Example:
Code:
A: If Level of (yourability) for casting unit is equal to 1 then do Set Life of Triggering unit to (Life of Triggering unit + 50).
A: If Level of (yourability) for casting unit is equal to 2 then do Set Life of Triggering unit to (Life of Triggering unit + 100).
A: If Level of (yourability) for casting unit is equal to 3 then do Set Life of Triggering unit to (Life of Triggering unit + 150).
I know this is a bad example...