You need two behaviours that use requirements. One behaviour adds buff stacks while the other removes them. The requirements then use some logic functions to add any additions, subtractions and multipliers.
An example of a similar system can be found in my choosable attribute system demo map.
Or you could have the buffs add the attributes.
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Considered easy altering of the unit textures?
http://static.sc2mapster.com/content/attachments/15/252/Screenshot2011-04-17_09_16_21.jpg
For my public assets look here!
http://www.sc2mapster.com/forums/resources/data-assets/46733-the-assets-of-evil/#1
Rileyb80 Regular ShmoeI'm trying to add a Buff per each level of an attribute however I don't think this is the right place to add it.
I even added an apply behaviour effect in the Point Gain area.
(note 0.2 armour is from the behaviour on the unit the other 0.2 armour is from the apply effect)



But no dice it seems that it only does it as 1 effect so that doesn't work