You could use the buff behaviour with Combat - Damage Response - Chance (set to chance of you wanting it to cast) and Combat - Damage Response - Handled (the effect used when hit) attached to a Issue Order effect (uses ability) connected to your ability.
That is if you can not link the behaviours and effects from the ability directly into the response.
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Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?
You could use the buff behaviour with Combat - Damage Response - Chance (set to chance of you wanting it to cast) and Combat - Damage Response - Handled (the effect used when hit) attached to a Issue Order effect (uses ability) connected to your ability.
That is if you can not link the behaviours and effects from the ability directly into the response.
Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?
https://www.sc2mapster.com/forums/resources/tutorials/179654-data-actor-events-message-texture-select-by-id
https://media.forgecdn.net/attachments/187/40/Screenshot2011-04-17_09_16_21.jpg