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That's only one card that has her flavor text, but I do findit quite interesting that they would choose that... It seems to imply her moving to a new plane. But no matter. I still feel that Elspeth is a champion of justice, and Elesh taking control of her would leave some physical form, as it does on all Elesh's minions.
Planeswalkers can't be phyrexianized, so I think elspeth is safe. The story's kinda funky at parts, but planeswalker sparks protect their owners from the oil that corrupts.
I doubt wizards would do such a thing though. To reveal that Elspeth brought the phyrexian oil to Theros would detract from the point of Theros. People would be like "ooh phyrexians are back" and wouldn't pay as much attention to the actual worldbuilding of Theros.
First, Darksteel has only ever been found on Mirrodin, so assuming the Darksteel Forge quote is actually about the forge, Elesh Norn is still on Mirrodin.
Second, Gideon left Zendikar searching for help. It's possible that Elspeth is doing the same thing.
Third, its unclear if a planewalker can be compleated and remain a planewalker, considering how transferring Venser's Spark into Karn freed Karn from the oil.
The lore is really janky, because for the longest time it was accepted that planeswalkers were immune to phyresis, due to basically all of the invasion story arc.
It seems that wizards has forgotten about it and retconned it, and are going with the concept that PW's can be infected. Which is really stupid, magic has a lot of lore behind it and it's all very deep and well-thought out, much more so than the stories they put out these days.
Even so, iirc Elspeth and Koth both got "immunized" by Melira, Sylvok Outcast , so they're doubly immune now?? The lore is foggy.
Also Goody, the phyrexians, eldrazi, and slivers are all small fish compared to Yawgmoth, who created the phyrexians, masterminded a multimillenia old arms buildup solely for the purpose of invading Dominaria, and whose very appearance on the plane caused millions to die on the spot. And he wasn't even a planeswalker.
But Krayhaft, Venser died of phthisis, not phyresis, and Karn was not a planeswalker when he arrived on Mirrodin because he had just sacrificed his spark to help close the Tolarian time rifts - thus leaving him vulnerable to phyresis.
So planeswalkers are indeed immune to phyresis.
Scars of Mirrodin block was really janky plot wise, because it presented a ton of continuity errors.
You're right x754, Venser was infected with phthisis, which is not the same as phyresis, but he died by teleporting his heart into Karn, thereby giving Karn his own spark. This by itself is really shady, since before this the spark was defined as not being attached to a biological part
Planeswalkers, by all logic and history from lore, should be immune to phyresis, but only from the oil. The corruption oil is a part of the process of phyresis, but it's not the only way. They can still be phyrexianized surgically, but this would probably destroy that spark. Planeswalker sparks are assumed, by lore, to protect their owners from corruption from phyrexian oil.
However, apparently this is not true. Here are two articles explaining this whole train wreck. Apparently it was retconned by creative, so that planeswalkers aren't immune to phyresis. The whole business is shady.