Elesh Norn, Mother of Machines not stopping ETB effects of cards entering from the graveyard.
I was playing Traditional Explorer against an opponent using a graveyard-based deck centered on Prized Amalgam, Creeping Chill, Silversmote Ghoul, and Ox of Agonas.
I had an Elesh Norn, Mother of Machines out when my opponent was able to bring their Silversmote Ghouls from the graveyard back to the battlefield. This then incorrectly gave them a triggered ability to return Prized Amalgam to the battlefield when Elesh Norn should prevent that from triggering.
Then, in that same turn, they cast Escaped their Ox of Agonas. Once again, the enters the battlefield ability should have been prevented by Elesh Norn, but they were still able to discard their hand and draw three new cards.
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Quaver3435#49289 commented
Elesh Norn Mother of Machines stops Lys Alana Huntmaster from creating Elf Warriors. I had Lys Alana Huntmaster out, which lets me create a elf warrior when i CAST an elf card. The opponent had Elesh Norn Mother of Machines out and that card stopped Lys Alana from creating the elf warriors. Lys Alana Huntmaster clearly states "cast". This is not an ETB effect and thus it should not be stopped by Elesh Norn Mother of Machines.
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[Deleted User] commented
Prized Amalgam in the graveyard is not a permanent, so its trigger is not stopped by Elesh Norn.
The Ox's trigger should have been stopped, though, you are right on that one.