This is not a end all means all guide. Situations may not allow for such a bursty champ with no defense.

This is a Yi Burst build it is very squishy but in team fights can take out virtually any champion in a matter of seconds. This build also counters mirror match if the other team contains a Master Yi.

Pros:

High burst

Clear jungle at high speed

Quick gold

Early kills

Win mirror matches

Good at Backdooring

Cons:

Susceptible to CCs such as stun and snares

Low defenses easily picked off as main target (Use alpha strike wisely)

Blue is good to start with then kill the super wraith followed by wolves. Take red after you kill the ghosts wraith camp as to have it for lvl 3 when you gank bot/top depending which is closer to your red (top purple/bot blue).

This build is very good at countering mirror matches and taking out squishies. Alpha Strike allows for more manuverability and allows you to quickly get to the back and target the adc while avoiding the tanks in front.

Very tanky champions will counter you especially late game which is why black cleaver is a very important addition. Also if you see a lot of players grabbing thornmail a maw of mortius will easily counter this damage.

Stuns are very hard on Master Yi as they mitigate damage, stop self heals, and prevent escape which means that in draft if you see a lot of stunners it is a good idea to take cleanse as a summoner spell.

It is better to not go into fights alone when fighting 3 or more enemies as your defense is very low. Remember your ultimate will help you take out towers more quickly as well as is a good in and out escape mechanism. Ward the map and have good map awareness