Bug: Interaction between Ashiok Dream Render and Oglor, Devoted Assistant
Ashiok, Dream Render causes a player to first mill four cards, then exile their graveyard.
Oglor, Devoted Assistant permanently gives cards that enter the graveyard from the library "When this card leaves your graveyard, create a tapped 2/2 black zombie creature token."
Since Ashiok causes cards to first enter the graveyard from the library, then leave the graveyard, creature cards that are milled in this way should first gain the "create zombie tokens" trait, then leave the graveyard, triggering the creation of zombie tokens. However, in my game today this interaction occurred several times, never creating zombie tokens.
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[Deleted User] commented
Ashiok's ability will fully resolve before Oglar's trigger go on the stack. By this point, the creatures have been exiled and cannot gain the ability from Oglar.