Tips to Use Mirana (Dota2)

• Moonlight Shadow is useful both as an escape ability for yourself and/or the team, and as a way to set up a gank. 

• As a strong semi-carry, Mirana is quite special - she doesn't really need farm early-mid game, thus making her a threat at that stage as a ganker. She is able to farm up items quite quickly by using Starstorm to clear creep waves as well. 

• The movement/attack speed bonus from Leap is quite significant, more than an activated Drum of Endurance. Position this correctly during teamfights to buff all your allies with it.

• Even a level 1 Sacred Arrow can give a large stun if far away enough. Hiding in the jungle at level 1 and hitting one at level 1 can secure an easy first blood if laning with a good partner. 

source:  http://dota2.gamepedia.com/Mirana