Not Updated For Current Season
This is my personal Cassiopeia build, this works best for me. Try it!
2 Crowd Control spells
Ultimate is a life saver. For everyone.
Infinite mana late game.
Slow spells, hard to aim.
Squishy early game.
Cassiopeia is a very Strong character with poison abilities. Her Twin Fang (E) ability STACKS with teemo's mushrooms and auto attacks. Her Noxious Blast (Q) is the strongest early spell and a low cool down of 3 seconds. Miasma (W) and Petrifying Gaze (R) are Cassiopeia's bread skills, setting up for others.
Cassiopeia is a Damage Over Time (DoT) character with low cool down spells. She is a decent chaser with her slow, self haste and stun spells. She is squishy early game but grows strong heavily later. Cassiopeia can deal a strong amount of damage to a team of 5 quickly.
Ganks: Flash(D/F) >> Petrifying Gaze >> Miasma >> Twin Fang >> Noxious Blast >> Twin Fang.
Team Fights: Petrifying Gaze >> Miasma >> Noxious Blast >> Twin Fang >> (repeat) Miasma.
IT IS VERY TEMPTING TO HARASS, but that will get you killed because you deal DoT and has full potential when not threatened by income damage. You are likely to kill a champion with your spells even after you die due to poison.
Only few things to remember:
LAST HIT: Attack the minions only when they're at low health causing you to gain the extra 25-35 gold.
STAY SAFE: Don't put yourself in danger, "curiosity killed the cat." as in do not check bushes just to see what's there. Dodge income attacks, try to not get hit and/or targeted.
BE A LEADER: Remember to remind your team about the Dragons global 240 gold, baron, golem/lizard buffs, Missing In Actions (MIA) and ganks.
CHECK OUT MY OTHER BUILDS!!
AP TRISTANA: http://www.mobafire.com/league-of-legends/build/tristanasonehitwonder-ap-7154