Malzahar: New ultimate idea

I see malzahar as the priest of the void. Using twisted void magic to summons minions AND control minions at his will.

This give me this idea:

R: cast on ground (decently large zone) - medium range Malzahar uses his void powers to control the enemy minions to do what he wants. Enemy minions cought in the ability change colors and now fight for you.

This would have huge implications on the game flow if used corretly. You can use this to counter push. defend turrets, empower more minions when you have baron buff, and so on.

Since it can be incredibily powerful it would need either a big CD, or some restriction . For example:

• Could be a time limit on how much you can keep the enemy minions under control.
• Or maybe you can't convert inibitor empowered minions.

What do you think?