I think you should get your Bloodthirster before your Youmuu's Ghostblade and you could use a mana regen item in there somewhere. I prefer getting Meki Pendant instead of boots as my starting item and then later upgrading it into a Manamune. This would be preferable to getting an Aegis of the Legion as well. Finally your runes are off. You should be getting armor seals not glyphs and crit damage runes are never a good idea. Also since you only have 18% crit chance anyway why waste the space? You should use armor seals and MR/lvl glyphs. Just my 2 cents.

Aegis stacks only on you and the other guy having the other Aegis, but the others will only get one instance of the aura, so its abit wasted. I think there are just better items for Urgot than Aegis. I know that Aegis is a ridiculously good value for money item, but it doesnt give as much protection as other higher tier defensive items.

Hey there. It's not a bad build. Youmuu's Ghostblade could be nice on Urgot. But I think you should not get Aegis of the Legion. If you'll know the true place of urgot in teamfight, you sure won't need this item.
Second thing is the Heal spell. I think this spell gives a little bit of health and is not necessary.

Peace.

Hey, thanks for your feedback.
First question: why Aegis of the Legion:

When your in a team fight and you use your ulti you get an additional bonus on your armor and magic resistance. So you stand in the middle of the enemy team and Aegis is just for an extra bonus on your armor. Sure the supporter can also buy that item. You know that Aegis can stack right?

Second Question: Auto attack or Skill

I use my Acid Hunter as the main damage. I slow them down with my W skill and when i use my Q and Auto Attack they have no chance of escaping.

Hi, nice guide you have here, but I have 2 questions, why get Aegis of the Legion? Shouldnt your support be the one getting it instead? Also, since there are many ways to play Urgot, which way are you playing him, as an autoattacker or as a physical caster relying mostly on his Acid Hunters to do dmg?

Also, Im quite sure the Ghostblade only gives you the bonus, and not your allies too.