Zilean is a flexible pick, that can work well with many different team compositions because of his kit. He only has one damaging ability but it also can double as a potentially huge AoE stun if you can land your double bomb. He has a huge slow or speed-up ability and another ability to save someone and revert their mistakes.

What more could you ask for? :)

Zilean fits well with most ADCs or Marksmen but he takes a little while to get off the ground though. He doesn't have any shields and can have many bad match-ups in the laning phase.

Your goal in the laning phase is to survive, build up manaflow band stacks and protect your ADC by double-bombing their ADC when an engagement happens. This is more difficult than it sounds, takes practice for sure. :)

I like going Sorcery with Aery for the shields and guaranteed damage. The other minor runes help us with mana, cooldown reduction and further boost our AP.

I'm trying out Domination secondary right now. There are a lot of snares, stuns and other bad effects for your allies in-game and being able to have your active items available more often feels great.

Zilean is about utility first and ability power second. Your Time Bomb does scale well and has good damage, but it's your only damaging ability. Your ability to control speed, stun enemies and revive allies is why you pick Zilean.

Zilean is squishy like Soraka, to be good with him you just have to practice. You'll die often because there are many champions that are lethal for you: Hook Champions, High mobility assassins like Fizz, Talon, LeBlanc and more. Keep practicing your double bomb combo and do not forget you can target yourself, allies, enemies, minions or the ground itself. Don't be afraid of missing your bombs, they're amazing as a tool to zone your enemies away, as you're basically saying, "Walk through this and get stunned." or "Step on this and you're taking 300+ damage."

Knowledge is king. Know thy enemy. You know some champions have certain abilities, certain attack ranges, high damage, invisibility. Respect this because they're going to ABUSE it against you.

Your positioning (for any champion) is one of the most important things you can learn and practice. Always remember your positioning in team fights. You're a squishy mage and your stun is not a 100% guaranteed.

Teemo's Toxic Shot