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Then, focus on Malefic Visions, levelling CotV when you can't. Don't get Null Zone until 12 (last possible). It's not that you don't want it's damage and zoning potential, but focusing CotV and MV allows you to maximize damage output. With the low cooldowns you get, you'll be a very busy clicker.
Try not to depend on your ult for damage so much as fight control. People ***** when you lock down a tank or CC, but losing a decisive tank can really turn a fight around. Put down your Null Zone to protect an angle while you lock down.
Sounds silly, but if your teammates are onboard, it will work very well and the enemy team will fall behind their towers, where you can pick it off.