Get Doran's Blade when u have a support that has sustain.
This is the perfect Choice and its also safe.
If you were forced to back in the early games u should get One
If you feel that u have an easy lane to win and have lots of gold before your 1st trip back get
straight away if not get
Your goal on the 20 min mark is to get
This is one of the most recommended item for tristana.
Quoted from above: As of December 22, 2012... This item is ridiculously strong vs. most team compositions. It gives a nice amount of health, as well as attack damage and it's passive stacks quickly with Tristana. Though I don't recommend this as a priority, I wouldn't put it down as a strong item when the opposition has a lot of armor.
Nice if the enemy team has tons of armor, but now i think the black cleaver has dominated almost every item.
Get this item last on the build because its actually not really needed for trist as she is far back from everyone. However, if a few times you find yourself being the last person remaining and dying to another person by a small margin in teamfights, it may be a good choice to pick this up.
must for most ADC's. With Tristana's ability to move around the map she shouldn't really need it. Of course there are enemies with a lot of movement speed as well which can cause you to get focused easily and not be able to escape. This can be a great pickup regardless of your playstyle.