Just a primary note: This is my first guide for any hero on any MOBA game so any discrepancies are unintentional and I'd appreciate them being pointed out in a non-aggressive manner.

With the changes made to Brightwing in the Butcher patch, most people had to change the way they built everyone's favourite psychopath.

These are my two default builds. Naturally I use Basic Build any time the other team doesn't have a stealther. If they have one or more, I build anti-stealth instead.

This is the basic build I use for quick matches and Hero League when I'm not against a Zeratul or Nova. It's all around the Soothing Mist and ensuring you can keep as much of your team alive in a fight as possible.

Level 1:
Unfurling Spray - Recommended - With a build not revolving around Phase Shift, and more on keeping the team alive, this is the best choice. It allows you to stay a bit further away from the fight and keep your team alive to take down theirs.
Bribe - Useful - In cases where the extra range on your heal isn't required, this talent is pretty useful. It can allow you to grab a free Siege camp every so often, and thanks to Phase Shift, be back in the fight before you're even needed.
Hyper Shift - Situational - Can be considered useful on larger maps (Garden of Terror, etc.), however isn't the best choice if you're not taking other talents to bump up the usefulness of Phase Shift.
Arcane Precision - Useless - Pretty useless talent unless your team has a few stuns, and perfect co-operation. Also not as useful for the role you should be playing.

Level 4:
Manic Pixie - Recommended - My personal favourite. The extra heals on a specific target is extremely nice in all situations.
Arcane Barrage - Useful - Decent if combined with Sticky Flare at 13, to secure kills or help escapes. Other than that, probably not the best.
Peekaboo! - Situational - Can be handy on some maps, such as Dragon Shire and Tomb of the Spider Queen, where vision is key. Not as great as the above two if the other team doesn't have stealthers, or possibly an Abathur.
Unstable Anomaly - Useless - Not really beneficial. You're not here to do damage, and to top it off the damage from this talent is negligible at best. It's not going to turn a fight around.

Level 7:
Mistified - Recommended - Out-shines Phase Shield, if you haven't also taken Hyper Shift. Can cause a couple of mana issues but nothing that can't be undone by playing carefully.
Phase Shield - Recommended - Combined with Hyper Shift this is probably still a better choice than Mistified. Don't be afraid to Phase Shift into a fight you're already at to save someone from a nasty ultimate.
Cleanse - Useful - Pretty handy against a team that consists of a lot of CC. Kael'thas, Thrall, Tyrande are good heroes to counter with this. It really ruins their momentum.
Dream Shot - Useless - Not worth taking, at all. The cooldown reduction is pitiful and it's really only even slightly good if you're going for a damage build.

Level 10:
Blink Heal - Recommended - It kind of goes without saying that if you're the support on your team, you need the healing.
Emerald Wind - Situational - Only not marking this as useless because it can be useful in VERY specific situations. Pushing away a Dragon Knight or Garden Terror. Interrupting their team from grabbing a Tribute. But the times it'll actually make a difference are exceptionally rare.

Level 13:
Shield Dust - Recommended - Very good, unless their entire team consists of auto-attack heroes. In which case, another talent would be good.
Sticky Flare - Useful - Can be useful combined with Arcane Barrage to secure a kill or an escape. Can also be good even without Arcane Barrage since it affects multiple enemies at a time.
Ice Block - Useful - Good for ensuring your survival. I'm personally not a huge fan of the "stasis" abilities. Only one I ever use is Void Prison. However I can appreciate it's usefulness if you've got help coming, since it'll usually sentence you to death if you use it while trying to escape.
Pixie Boost - Useless - Basically a worse version of Sticky Flare, since it'll only affect 1 (2 with Bouncy Dust) target at a time, rather than everyone chasing you.

Level 16:
Bouncy Dust - Recommended - An all-around great talent. Even better if you combine it with almost any other Pixie Dust talent. Combine it with Manic Pixie and the enemy team will truely start to understand how much healing you can do. And to go the other way.
Critterize - Useful - Highly beneficial in a teamfight. It can sentence almost any member of their team to death if timed properly. And since Polymorph is integral to your "rotation" (I hesitate to use that word in a MOBA but it's the closest I could get), it'll just prove more benficial.
Hardened Focus - Useful - Can be good to get off more abilities to trigger Mistified more regularly. Will give you even more mana issues than Mistified does by itself but again, can easily be fixed by just playing careful and not firing Arcane Flares all over the map.
Greater Polymorph - Situational - Rarely will this be more useful than Critterize (If you're going for a Polymorph build), as the duration increase won't necessarily increase your odds of a kill.

Level 20:
Revitalizing Mist - Recommended - Perfect when combined with Unfurling Spray and Mistified. The longer a teamfight goes on the better your healing gets. Gives you more freedom to throw out Polymorph and Arcane Flare instead of just Pixie Dust.
Storm Shield - Recommended - Great if they've got a lot of AoE burst. Such as a Kael'thas or Jaina, or if you're at their core and need that last push of durability.
Rewind - Useful - Can be handy, again, when combined with Mistified, to get off a lot of spells very quickly for maximum healing, however it's not as good as the two above.
Double Wyrmhole - Useful - Same idea as Rewind to get off a lot of high-restoration healing. Personally I'm not a fan of this talent because it's rare you'll need to Blink Heal twice in such quick succession.
Continuous Winds - Useless - Completely useless for the role you should be playing. Emerald Wind is entirely situational purely because there's only 1 other choice. Literally any other talent in this tier is better than Continuous Winds. Avoid.

This is the build I use if I am against a Nova or a Zeratul (Or any future stealthers they may add). Since breaking their stealth usually ruins their openings and can take them right out of a fight, this build is near perfect. I've not once lost to a team containing a stealther with this build.

Note: The talents from 10 and up are copied and pasted from the default build, since they are not changed. It is the 1, 4 and 7 talents that are changed in this build only.

Level 1:
Hyper Shift - Recommended - Used for using more Phase Shifts in a game. Nearly required when building around Peekaboo! to ruin their stealther's days.
Unfurling Spray - Useful - Still very good, however not as good as Hyper Shift combined with Peekaboo! and Phase Shield to do what we're aiming for in this build.
Bribe - Situational - Can still be good for taking a free camp every so often, but not as good as Unfurling Spray and this time, it's also below Hyper Shift.
Arcane Precision - Useless - Pretty useless talent unless your team has a few stuns, and perfect co-operation. Also not as useful for the role you should be playing.

Level 4:
Peekaboo! - Recommended - The entire reason for this build. Shows you everything near you and your buddy, including those nasty stealthers, so you can ruin their day and almost guarantee a kill if they were planning on opening as you warped in.
Manic Pixie - Useful - Still a very good choice, however Peekaboo! is vital to this build.
Arcane Barrage - Situational - Still situational, again, but Peekaboo! is the entire reason for this build.
Unstable Anomaly - Situational - See above. Peekaboo!. That is all.

Level 7:
Phase Shield - Recommended - Since you will be using a lot more Phase Shifts, this will come in very handy. Usually phasing in and revealing a stealther will make them flee, but on the off chance they decide to go for it anyway, this talent could make a difference.
Mistified - Useful - Can still be a viable choice when combined with Revitalizing Mist, but that doesn't kick in until much later in the game. I'm personally a huge fan of not having to use more mana to save people, hence Phase Shield.
Cleanse - Useful - Still great against those annoying stunners, etc.
Dream Shot - Useless - The cooldown reduction is no good here, especially considering the other options.

Level 10:
Blink Heal - Recommended - It kind of goes without saying that if you're the support on your team, you need the healing.
Emerald Wind - Situational - Only not marking this as useless because it can be useful in VERY specific situations. Pushing away a Dragon Knight or Garden Terror. Interrupting their team from grabbing a Tribute. But the times it'll actually make a difference are exceptionally rare.

Level 13:
Shield Dust - Recommended - Very good, unless their entire team consists of auto-attack heroes. In which case, another talent would be good.
Sticky Flare - Useful - Can be useful combined with Arcane Barrage to secure a kill or an escape. Can also be good even without Arcane Barrage since it affects multiple enemies at a time.
Ice Block - Useful - Good for ensuring your survival. I'm personally not a huge fan of the "stasis" abilities. Only one I ever use is Void Prison. However I can appreciate it's usefulness if you've got help coming, since it'll usually sentence you to death if you use it while trying to escape.
Pixie Boost - Useless - Basically a worse version of Sticky Flare, since it'll only affect 1 (2 with Bouncy Dust) target at a time, rather than everyone chasing you.

Level 16:
Bouncy Dust - Recommended - An all-around great talent. Even better if you combine it with almost any other Pixie Dust talent. Combine it with Manic Pixie and the enemy team will truely start to understand how much healing you can do. And to go the other way.
Critterize - Useful - Highly beneficial in a teamfight. It can sentence almost any member of their team to death if timed properly. And since Polymorph is integral to your "rotation" (I hesitate to use that word in a MOBA but it's the closest I could get), it'll just prove more benficial.
Hardened Focus - Useful - Can be good to get off more abilities to trigger Mistified more regularly. Will give you even more mana issues than Mistified does by itself but again, can easily be fixed by just playing careful and not firing Arcane Flares all over the map.
Greater Polymorph - Situational - Rarely will this be more useful than Critterize (If you're going for a Polymorph build), as the duration increase won't necessarily increase your odds of a kill.

Level 20:
Revitalizing Mist - Recommended - Perfect when combined with Unfurling Spray and Mistified. The longer a teamfight goes on the better your healing gets. Gives you more freedom to throw out Polymorph and Arcane Flare instead of just Pixie Dust.
Storm Shield - Recommended - Great if they've got a lot of AoE burst. Such as a Kael'thas or Jaina, or if you're at their core and need that last push of durability.
Rewind - Useful - Can be handy, again, when combined with Mistified, to get off a lot of spells very quickly for maximum healing, however it's not as good as the two above.
Double Wyrmhole - Useful - Same idea as Rewind to get off a lot of high-restoration healing. Personally I'm not a fan of this talent because it's rare you'll need to Blink Heal twice in such quick succession.
Continuous Winds - Useless - Completely useless for the role you should be playing. Emerald Wind is entirely situational purely because there's only 1 other choice. Literally any other talent in this tier is better than Continuous Winds. Avoid.

These are the two builds in my opinion that best suit how Brightwing works: Darting around the map helping allies and screwing up the enemy team's day.

At some point I'd like to add a couple of extra builds (CC and Damage) for if you're a secondary support to a Malfurion or Lili. But that'll be done another day.

Thanks for reading, and I can't wait to see what people think.