Master Yi Build
fighting different enemiesGrouped up Champions
Be very careful when trying to attack more than 2 enemies. DO NOT ATTACK ALL 5 ENEMIES WITHOUT YOUR ULTIMATE!!! When attacking 2 enemies, you may not need to heal yourself. If you need to heal yourself, do so (w). When attacking more than 2, first Alpha Strike (w) into the middle of the enemies. After discharging your statikk shiv (basic attack) go into meditation (w). This may sound strange at first until you realize that enemies will try to get their spells out on you as soon as possible and if you have sunfire cape you damage them. After meditation use Juju style (e) and start with supports (champions that can block your damage or heal their allies) or lowest health enemy. Use Highlander (R) if needed.
Minions and champion
If a champion is attacking a tower with their minions use the combo: Q to damage minions and basic strike to discharge shiv W to heal if needed E if your having trouble with the champion.
If there is just a group of minions you could Q into them and hit once. Against only minions, you do not need to do much with the sunfire cape kiling them. You can attack but I normally use this time to take a bite of food or something.