One of the most difficult and spectacular procasts for an Invoker requires careful preparation and enhanced equipment – it is important to reach level 25, as well as have an Ocatarium and a Refresher with you. The beginning of the combo should be built with Alacrity as the first spell and Tornado on the second. Remember the sequence: Alacriti is a Tornado. 

To succeed, I recommend initiating an attacking moment with a secret blink or a hidden invis. Be sure to use this combo only in the later stages of the game, when you have full equipment and the Ocatarium and the Refresher are activated. Also, do not forget about the Aganim Shard and Aganim Spectrum to maximize the damage done and improve the EMP effect. The first time you try this procast, you will be able to surprise your opponent — even Morphing will not stand, regardless of its tarascos! I hope this description will help you in mastering the complex mechanics of Invoker!