You leave a lot up to the imagination with that description.
Anyway, try this. I just took NightskyAuraora's Meat Hook map and added an Autocast ability to it. It's basically Pudge's Meat Hook from DotA but it can be autocasted like the Slow ability. Give credits to NightSkyAurora if you use it.
To import it you'll want to copy and paste the Meathook folder, Unit Indexer folder, and the Autocast Meathook trigger into your map. Plus you'll need the dummy unit and the Autocast Ability/Buff from the Object Editor.
Note that I used the Slow ability to autocast the meat hook. Which means that you can only target units with the ability. There aren't any Autocast abilities that target Points so you're stuck with targeting Units. If you want the ability to be able to target both Points and Units I'd have to trigger some kind of special Autocasting system.