Broken Card interaction with Phyrexian Dragon Engine
I brought Phyrexian Dragon Engine to the battlefield from my graveyard using Rivaz of the Claw. And Phyrexian Dragon Engine's EtB didn't trigger. Phyrexian Dragon Engine says that when it enters the battlefield from your graveyard, you can discard you hand and draw three. I brought it to the battlefield using Rivaz of the Claw's "Once during each of your turns, you may cast a Dragon creature spell from your graveyard." Phyrexian Dragon Engine was brought to the graveyard and nothing happed. It did not give me the option to discard and draw three.
This happened on PC
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Grimsdale commented
Experienced similar interaction with Serra Paragon in my battlefield and casting Phyrexian Dragon Engine from my graveyard. No etb from graveyard trigger for Phyrexian Dragon Engine.
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[Deleted User] commented
If you cast Phyrexian Dragon Engine, it didnt enter the battlefield from your graveyard, it went to the stack, resolved, and then entered the battlefield