I don't think biology or physics apply. They're both the study of the physical world.
You're going to have to defend your assertion that planeswalker abilities are controlled biologically.
With the exception of Karn, which is an artificial Planeswalker that was created by Urza, planeswalkers are mostly biological in nature, and don't have a clearly mechanical means to activate their abilities.
Neither does Karn.
Karn isn't an artificial planeswalker in the sense that he's built to planeswalk, but rather, he's the conglomeration of souls that makes up the gestalt being known as Karn.
And one of those souls is Urza.
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In fact, all mages don't have a mechanical or technological means to activate their abilities. So somehow, their control over these special powers is a phenomena that biology should be trying to explain. Planeswalkers are able to control their powers with significantly more finesse than something that just magically does stuff at random. Therefore, there needs to be a way that they control this power, and be able to think about what they want done with their power.
If we were to show the logic architecture of doing anything, it looks something like this:
Brain -> something -> action.
For controlling machines and irl tech, it looks something like this:
Brain -> move finger -> finger manipulates outside world -> buttons pressed on machine -> machine does instructions.
But what about planeswalking or spellcasting? The logic architecture doesn't have anything to explain how mages call upon energy to do work, or shift spacetime, unless they have an extra, unknown appendage to make this work.
That's exactlt the phyrexian logic that led yawgmoth to look for an organ, but we've been explicitly told it's part of the soul, something that to our knowledge has no physicality.
So how do you propose we find the biology of the soul?
What is, after all, the nature of the soul?
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If the laws of physics alone had to bend to ensure this spell casting would work, the movement of everyone is going to be extremely restricted, because the current known ways for a body to interact with the outside world is simply mechanical, or through excretions. At the moment, it appears unlikely the body can produce enough electricity to create an electric discharge strong enough to kill people.
In a world such as MtG, the laws of biology would have to bend to support the multiverse's existing phenomena.
The act of planeswalking, in most instances, is described in terms without physical experience. It's a disembodiment because the Blind Eternities are anathema to matter itself.
Part of the problem with trying to use physics is that physics is unequipped to process mana and aether. Our understanding of it can't include those elements.
A huge part of spellcasting is tied to either intellectual pursuit or spirituality, things that are impossible to biologically quantify.