Sry that this won't solve your problem completely but here is the problem:
The triggers start before he even casts the ability so you cancel it before he casts it. If you add a 'Wait 0.5 seconds' on your MysticAntler Copy trigger where he casts the ability, you will lose mana and will have cooldown. But then, some effects are lost. All the rest triggers should happen after this. I couldn't make both to have cooldown and the effects not to disappear. Changing the ability with another target point ability won't solve it. It's somewhere in the groups that you pick. Honestly I don't know this approach, I would use some different triggers if I were doing it, because I don't know how these actions should look.
You may wanna replace the SHockwave with smth that doesn't cause the ground to ripple like flame strike maybe, coz when you make it, you will have the ground ripple unless you want it. It doesn't ripple coz you don't cast the ability, otherwise u would see it. I hope sum1 will solve your prob fully.
As for the leaks i didn't have the time to check.
