Autocast as event trigger

[Zhall]

Which ability will allow me to trigger an event on a trigger with each cast?

I've used the pocket factory unit spawn in the past, and used the unit enters playable map area event, but you end up with thousands of units being made (instantly removed) by the end of the game.

Thanks

 

[Ezekiel12]

Please clarify your question. Every ability can trigger a trigger on cast with a Unit casts ability event and several other events.

 

[NightSkyAurora]

Any active ability can trigger an event in a trigger

 

[Zhall]

Basically I want an item to spawn every time a priest casts heal.

I'm looking for a spell that will constantly auto cast by itself.