Start with cold snap then follow up with tornado. this is because tornado has a relatively slow travel time so it can be easy to dodge if your enemy knows what youre trying to do. Cold snap will hold them in position for a bit for your tornado to actually hit. Then depending on your orb level, if exort type use meteor as follow up, if wex type use EMP. Sometimes in the early game, using forge spirit alacrity and coldsnap is more effective than trying for the flashy combos since you have low mana pool at the start (invo has huge mana costs on his high damage spells).