Core sets have been a part of Magic since its inception
Other than specific cards that have "Trample Over Planeswalkers", you won't take any excess damage dealt to a Planeswalker
If you plot an instant with Lilah, Undefeated Slickshot, you can cast the plotted instant for free on a later turn, but since it was plotted you'll have to cast it at sorcery speed
With flash and being uncounterable, it completely messes up control plays
Regardless, when you open a Japanese booster box, you are guaranteed to have at least some pulls, even if they arent the ones you wanted, and because all ARs are seeded the same as any other AR, manipulation of these card prices or highly inflated prices due to bad pull rates is almost impossible
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