oh yeah, aegi to OU would be a good idea. . . though I didn't think we banned it in the first place.
Checks using standard sets include Mandibuzz (Foul Play, bulk, can phaze), Bisharp (Dies to Sacred Sword, but doesn't care about King's Shield and outspeeds Aegislash), Sableye (Will-O-Wisp won't set off a Weakness Policy), Skarmory (phazing), Support Talonflame, possibly even Gengar.