@JohnPhobia: Goif rana is right the buff validator solution is the best one. BUT if you want several units to be able to cast the same ability on the target, but just prevent double cast from one caster things become dirty. you then have to work with markers (since you cannot easily validate the origin of a buff which is something i want for a long time already). and instead (or in combination with ) of using a buff, you have to use a persistant effect. the marker of the persistant has to be the same marker of your first effect of the ability and then validate with "no marker". you might need 2 effects in a row on your ability with the same marker ( no idea why, set effect worked for me)
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@JohnPhobia: Goif rana is right the buff validator solution is the best one. BUT if you want several units to be able to cast the same ability on the target, but just prevent double cast from one caster things become dirty. you then have to work with markers (since you cannot easily validate the origin of a buff which is something i want for a long time already). and instead (or in combination with ) of using a buff, you have to use a persistant effect. the marker of the persistant has to be the same marker of your first effect of the ability and then validate with "no marker". you might need 2 effects in a row on your ability with the same marker ( no idea why, set effect worked for me)