If this proves impossible, consider that you may need to focus on which of Zilean's allies you can kill the fastest over which one is dealing the most damage. Zilean's mobility with Time Warp makes it difficult to finish him off without a well-orchestrated ambush, for he can easily bait...
As you guys can see, I've just released the second build that you've all been asking for since... well, since I've released the first one. This time, Zilean uses Ignite to set his enemies on fire, and doesn't rely on Clarity for mana. I've decided to include this second method...