Nahiri, Sorin, Liliana, Bolas, Nixilis, Karn and Ugin are the only old-style planeswalkers likely to appear in the story from now on, and they've all lost a large portion of their powers.
The rest of the current set of planeswalkers can be assumed to be younger than the Mending, and I'm not typing out all their names.
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“Tell me who you walk with, and I'll tell you who you are.” Esmeralda Santiago Art is life itself.
Ugin, Nicol Bolas, Karn, Sorin, Nahiri, Ob Nixilis, and Liliana are all Oldwalkers. Ashiok and Tamiyo have been speculated to be Oldwalkers too, but there hasn't been any confirmation on that. (Presumably there are plenty of other Oldwalkers out there, we just haven't seen them since they're not important to the story.) The rest of the Planeswalkers involved in the current stories were all born after the Mending.
what planeswalkers are from the "old kind"(immortal) and what are from the new one?
Even old walkers aren't immortal any longer. They lost that quality with The Mending. It's just that by this timeframe we're only likely to ever meet old walkers with extended lifespans not inherent to the oldwalker spark (as the others are likely all dead now).
Bolas and Ugin are dragons so their natural lifespan is thousands and thousands of years.
Karn is a robot. (Edit: Karn not Karen you damned autocorrect.)
Sorin is a vampire.
Nahiri was trapped in stasis until very recently.
Lilianna made her demon deals to restore her youth.
Ob Nixilis... honestly I'm not sure about him, but it likely has to do with his demon form.
By this point we're unlikely to ever meet another former oldwalker with a standard human lifespan (unless there's some qualifier to explain it away).
Ob is a demon, and thus a mana construct, and thus ageless.
He can certainly be killed, but not by old age.
Regular demons are mana constructs. Ob is in a demon form, but it remains to be seen how close he is to a regular demon. Given that he has a spark, it's likely that he's biologically a demon but not just a mana construct (or he wouldn't have a soul and thus no spark).
You're right that he can't die of old age, especially since he survived on Zendikar for at least 1,000 years without access to his spark.
The rest of the current set of planeswalkers can be assumed to be younger than the Mending, and I'm not typing out all their names.
Art is life itself.
Even old walkers aren't immortal any longer. They lost that quality with The Mending. It's just that by this timeframe we're only likely to ever meet old walkers with extended lifespans not inherent to the oldwalker spark (as the others are likely all dead now).
Bolas and Ugin are dragons so their natural lifespan is thousands and thousands of years.
Karn is a robot. (Edit: Karn not Karen you damned autocorrect.)
Sorin is a vampire.
Nahiri was trapped in stasis until very recently.
Lilianna made her demon deals to restore her youth.
Ob Nixilis... honestly I'm not sure about him, but it likely has to do with his demon form.
By this point we're unlikely to ever meet another former oldwalker with a standard human lifespan (unless there's some qualifier to explain it away).
He can certainly be killed, but not by old age.
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You're right that he can't die of old age, especially since he survived on Zendikar for at least 1,000 years without access to his spark.
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