I like the idea, but this would make some champions unbelievably strong. Counterplay for it? Can't use abilities while Windwalk is activated, and you have a 1 or 2 second delay coming out of it where you can't use your abilities.

Free stealth would make some champions broken as hell. Yet, I agree that a new useful summoner spell could be a good thing. Besides Smite and Exhaust, the only one you see other than Ignite, is Teleport. Heal is used on supports [Not all of them], Ghost is just for some champions. The rest, is a little rare. I know cleanse is used more on high tiers, but Im not there yet, so...

Teemo walks into a brush in vision of enemy, activates his passive invis, enemy chucks aoes waiting you out, activate windwalk, walk away while the enemy camps the spot for the next 30 seconds lol.

Make it so you don't get any stealth at all if you take damage. Five seconds of invisibility is too much of a guaranteed escape for some champions.

If they do add in this spell, then champions with stealth abilities will become less unique.

Isn't that the same thing as Kha'zix ult?

make it 2 seconds, like barrier and it might be ok. however on the whole all champs with extended stealth have been nerfed because the stealth itself is op. it'd be REALLY hard to balance a mechanic such as stealth because kits need to revolve around it or else they fall off and become terriblly weak (see post-nerf old eve). remember when shaco had a 5 second stealth? remember when vayne's ult was 2 second stealth? remember late-game roaming twitch with 6 items?

stealth has a way of making things very unbalanced and end up being exploited to the point of it being downright toxic to play against.

All of summoners rift is now garen's bush.

You will never be safe again.

So you want to turn everybody into Rengar or Talon? It may be viable with a CD close to revive.

Maybe it should be lower duration, but 5 seconds isn't really thaaat long.