For Matrix Storm you want a Create Persistent effect that uses a periodic Search Area effect that uses a Switch effect based on if the target is friend/foe. The rest is pretty straight forward.
Magnetic pulse would just be an Effect - Instant ability that uses a Search Area effect that uses Launch Missile effects to launch your mechanical units towards the caster.
The Creep-spew would probably best be done with an Arm Magazine ability so that the invisible creep generating units are kept in their relative positions using the leash.
Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?