PROS
- Great utility late game
- Exceptional burst
- Super annoying against anyone

CONS
- Incredibly hard to farm, especially early game
- Squishy. Very squishy.

when your talking about early game laning with zilean, mana is the name of the game. Until you get a tear, conserving your mana is incredibly difficult. I'm still not sure how to spend my mana appropriately early game (other than to save enough for a combo at level 2), but I get the feeling you should save enough mana for a full combo at any time post-tear.

But before the first back, try to make sure that you bomb just the champion, as every bomb you use is a massive investment of mana, and bombing a minion only to have the enemy waltz away is a huge mistake, and a solid downer.

Last hitting takes a lot of focus. His huge attack delay combined with slow projectile speeds means that your best bet is to get as close to your target as possible without putting yourself at risk. At higher levels it gets easier, but the first few waves are a nightmare.

By the time you hit level 2, you should have saved enough mana for a Q-W-Q combo. What you do next depends on your mmr/elo. If your playing against competent opponents, just Q'ing the champion will do just fine, however if your playing in silver 1 or below, the best course of action is to double bomb a ranged creep near the champion. This does a massive amount of damage to the enemy, equal to 2 bombs instantly detonating. This is because bombs explode when 3 different criteria are met.

1. The timer ticks down to 0.
2. Another bomb is placed on the target.
3. The target dies.

What you are doing, is first bombing a ranged creep once. This starts the timer. The next step is to rewind and re-bomb the creep again. This activates the second criteria and causes the bomb to explode. However, in doing so the target dies, causing the third criteria to be met, and the second bomb to explode as well. So you get the damage of 2 bombs faster.

If the enemy knows what theyre doing, they would be aware you probably have no more mana, and cant do that again for another minute or so. But if your playing against a scrub with no idea of the concept of cooldown timers/mana other than their own, their first reaction will be to leave the lane. This is why the tactic is only useful in lane against unskilled opponents.

These are things ive come to learn about Zilean after playing as him for a while.

-Try double bombing ranged creeps near a champion, rather than double bombing the champion. When the creep dies from the first bomb, the second will automatically go off, resulting in a huge amount of damage. You can use this to get the psychological edge against your opponent as well, especially at low elo where people dont understand the concept of burst and/or ability cooldowns.

-With a certain amount of CDR (around 20%) You can chain Time Shifts ("E") indefinitely. This perma-boost can be mana intensive, but during teamfights it can be crucial to have give your adc that extra movement speed during the fight, especially if theyre playing a champion like Vayne who relies a lot of positioning.

-Try to avoid using your Ultimate on yourself if you know your going to die. It may seem tempting to act selfishly and prolong your own existence, but if your getting mowed down and theres no way you can escape, its best not to waste the ability. That being said, target priority for ulting is a difficult process that can be hard to master.

-Don't forget your "E" can also slow enemies down! Many times ive seen a Gank fail simply because the friendly Zilean chose to speed up themselves or their jungler rather than slow down their opponent. Think about it this way: In relation to you and your jungler, slowing the enemy down by 55% will technically by increasing both of your movement speeds by 55%, whereas picking just one or the other will only be half as effective. Also, Movement speed increases are subject to diminishing returns, whereas decreases are not for a very high amount. On top of all that, the fact that the movement speed formula is multiplicative means that the % decrease will be more effective than the % increase.