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Why does it need to be seen on at least 2 planes?  I think that's arbitrary garbage.

And I'm going to nitpick every decision you made, because that's really the point of this article.

Slivers are pretty awesome and distinct, and I think they pull a lot of their uniformity from the "everybody gains..." mechanic.  The original slivers were pretty distinct from one another (arguably too distinct), and I think the Legions slivers could use some more variety, but overall I think they work.  I always felt like Metalic Sliver and Horned Sliver looked most like the archetypal sliver (with a big, long, rigid crest, rather than the snakey stuff seen on Plated Sliver and Pulmonic Sliver ), but I think anything with one claw, two tails, a funny head and no legs would look like a sliver to me.

For the Baloths, you condemned them for their lack of uniformity, and then claimed that wurms were a "unique Magic property".  WTF?  I've not seen a baloth in any other property, and a Google search for "baloth" turns up nothing but Magic websites.  Wurms are a staple of fantasy in general, popping up in everything from DnD to Dune to Tremors and more.  Furthermore, wurms in Magic lack uniformity just as badly as the Baloth does -- Craw Wurm , Arrogant Wurm , Autochthon Wurm , Bellowing Tanglewurm , Charnelhoard Wurm , Duskdale Wurm , et al.  That's only a tiny selection of this creature type which exists in many properties, even outside of dedicated fantasy properties.  Magic cannot possibly claim "wurms" as its own.  At the same time, the variety represented in the wurms demonstrates how a large number of visually distinct representations can all be the same thing.  Baloths are big, loud, and menacing, whatever they are, and there's a much stronger case for them being "a unique Magic property".  In other words, if I were establishing my own new IP, Wurms would be on the table and there's not a darned thing you can do about it, but Baloth is all yours and the courts will back you up.

Hellions are pretty cool, and I like them.  They're definitely unique, although I think they're ultimately derived from the wurm heritage (but they're distinct enough with their barbules and affinity for fire to get by).  The term "Hellion" is not distinct to Magic, but Hellions as fire wurms with tentacles is.

The Vedalkin is a color-swapped person -- they're blue humans.  Ditto the Kor, who are white humans, although the barbule beards are pretty cool.  The Kithkin are just squat halflings or hobbits, existing archetypally in fantasy.  If we're tossing out all the anthropomorphic animal/people (which I can respect), then I think the Viashino have to go because they're nothing more than lizard men.  Giving the groups unique names lets you own the name, but it doesn't change that they aren't fundamentally derivative creatively.  The Kithkin's psychic connection isn't completely unique either, it being a staple of science fiction and fantasy (and already popping up in the Slivers, for heaven sake).

I do agree that Phedagrifs are pretty cool, and "distinct enough".  I'm kinda surprised I didn't see one in Time Spiral block.  "Normal animal with wings" might not really qualify as creative, but I think this one manages to do its thing well enough.  Everything is made from other little bits in the end.