Procast on a squirrel with maximum damage. To do this, you will need the following items: Aganim, Shard, Gleipnir and Bludthorn. Make sure you have quick casts enabled.
The macro will work both when hovering over a point and when hovering over a hero. The only difference is the use of the Bloodthorn, which will only be used when pointing at the hero.
It is important to remember that I refused to use the ethereal in this build, however, if you want to add it, you will have to adjust the timings to reduce the time of the cast of the ulta.