You want to do the dot with a buff that when it expires applies a buff to the caster. This second buff then reveals the buttons of an Augment type ability that allows you to choose the "upgrade". The upgrade applies one buff and removes the counter buff. Finally just give the first ability a single charge that does not regenerate.
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Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?
You want to do the dot with a buff that when it expires applies a buff to the caster. This second buff then reveals the buttons of an Augment type ability that allows you to choose the "upgrade". The upgrade applies one buff and removes the counter buff. Finally just give the first ability a single charge that does not regenerate.
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