Okay I have this really cool idea to make an awesome turret defense map but my ideas won't work unless I can find out how to make this stuff happen.

Basically for instance there is what you call a Slow Tower...and when u create a slow tower, a Queen is created above it and given to Player 7 (Computer). Player 7 has Ensnare ability researched and enough energy to do the spell. I tried to test it myself by messing around and my results weren't good so I don't know if maybe I was doing something wrong. I want it to where...the Queen stays above the tower (not a problem) and casts Ensnare on the passing enemies as the go by if the Queen has enough energy. This is basically a Slow Tower effect and I use death counts to reset the energy every now and then.

I have a test map I will attach to show what I meant....I also have a SV (for EMP Shockwave) and an Arbiter (For Stasis Field)....these are just some tower effects I wanted to add to my Tower Defense...so if this is possible, let me know whats up and what I can do, or how to do it....thanks!

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If this tower is not controlled by a human player you will have problems letting the units reliably cast their spells.
But here you can read how to encourage the computer to do it.
Zerg spells, Terran and Protoss
These 3 links contain mostly the same information. I still link you to them because they may or may not contain one piece of information that isn't included on the other site.