If Angel of Sanctions is already on the battlefield and it had exiled a creature, what happens if an ability takes its abilities away (like Humility) and then the angel leaves the battlefield? Does the creature return since it's a delayed trigger or does it stay exiled?
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If a permanent was exiled with Angel of Sanctions, that card will return to the battlefield immediately after Angel of Sanctions leaves it, even if Angel of Sanctions has no abilities by then (C.R. 610.3, 610.3b). See also this thread.
Note that Angel of Sanctions's first triggered ability has the form "exile ... until ...", which does not express a delayed triggered ability (compare C.R. 610.3 with C.R. 603.7; also compare Angel of Sanctions with Animate Dead and Angel of Serenity).
EDIT (Jul. 2): The relevant part of one rule was moved in the Core Set 2021 update.
EDIT (Jul. 1, 2022): Edited slightly.
BGU [Primer] Sidisi, Brood Tyrant BGU | BG [Primer] Mazirek, Kraul Death Priest BG | G [Primer] Polukranos, World Eater G
My YouTube Channel:
The Commander Tavern - a channel I just started where I'll post deck techs and gameplays. Please support by checking it out. Maybe you'll like its content and subscribe! Thanks!
Note that Angel of Sanctions's first triggered ability has the form "exile ... until ...", which does not express a delayed triggered ability (compare C.R. 610.3 with C.R. 603.7; also compare Angel of Sanctions with Animate Dead and Angel of Serenity).
EDIT (Jul. 2): The relevant part of one rule was moved in the Core Set 2021 update.
EDIT (Jul. 1, 2022): Edited slightly.