Every pro-player knows that agility heroes make the best carries. They have higher damage output and attack faster than their competition. So I've been experimenting with the hardest and most popular agility carry in the game Phantom Assassin, and it seems that a bug in Dota 2 makes the all agility stat push insanely over-powered.
Phantom Assassin's standard skill set is pretty good, but with the best agility gain in the game, by getting an early first blood and three or four more kills in a row you can burst out ahead of the pack and simply smash the enemy team before they know what hit them. I know it sounds crazy, but skip Stifling Dagger, Phantom Strike, and instead of getting Blur, simply buy a Talisman of Evasion. The only exception is when you hit 6, 11 and 16 you should skill your ult for some absolutely ridiculous 3000 + damage output by the end of the game.
The first few levels are the hardest to pull off. Without any spells you are going to have to have a support to babysit you and help you out with last hits. Don't be afraid to ask your teammates for some Tango (Shared) to keep your health up.
There is a small chance that you could get killed in the beginning. But giving up first blood, or even second and third blood is fine because you will make up for it in late game when you are literally spamming crits from Coup de Grace.
Spend all of your money on items that boost your agility. Think a about banking a few Blade of Alacrity to eventually build into Yasha.
Since you aren't taking any points in Blur it is important to stack at least two evasion items. Start with a Talisman of Evasion and maybe a late game Radiance.
At level 6 when you've gotten a single point in Coupe de Grace you should have enough attack speed to decimate Rosh. Head in there immediately and get that solo kill. The experience will get you another few levels and greatly boost agility.
After Rosh, if you ever see moment where the enemy team is all together while yours is spread out on the map, know that this is your opportunity to shine. With your lightning fast attack speed you can pretty much just dive into the middle of them and gurantee that you will cut them down before they even know what hit them. Since you don't have Phantom Strike the only tricky part will be getting close enough to them. Try hiding behind a tree an waiting for them to push the wave. Then jump out from behind it and smack them to death.
You, and they, will be surprised at how quickly they fall.
So there's no single correct way to play any hero. Especially one with the staggeringly high skill-cap of Phantom Assassin. This new agility build is a little revolutionary, but I'm sure that some people here have advice that absolutely needs to be included in this guide. Let me know your thoughts and lets get this to be the very top guide that helps new players learn this incredibly competitive hero.