Add Tokens to Database

I'm stumped with a card field. Rarity. It ranges from 0 to 5. So you would think it would only go from 0 to 3. As 0 is common, 1 is uncommon, 2 is Rare and 3 is Mythical Rare. So what is 4 & 5? I wanted to figure out myself but when I looked up a rarity 5 card on the gatherer it showed up as rare. Then I saw the user ratings on the gatherer, so is it perhaps the ratings? You just clarify this for me. Thank you.
Nevermind, felt like an idiot when realizing I could use the app itself.

And what is the part field? I assume its for double sided cards and such, but I'd rather make sure than screw up.

Should I create a new expansion for the plane cards as  Akroma's Vengeance is listed as the first card, and the plane, Academy at Tolaria West is also listed as the first card?

EDIT: I am creating new expansions for the extra stuff, it set up to be like this: "original expansion name": "whatever the extrastuff is"

i am leaving the order, code 2 & 3 fields alone as I don't know what they are. I am also making a new block for the tokens so it doesn't clutter the original blocks. Lastly I am going to send the files in a zip back as I am send an Excel Book with different sheets representing each changed file, as well as the changed csv files them selves to allow you easy viewing of the changes, as well as custom versions of the plane die icons, CHAOS and the other one.

I made icons for the two sides of the planar die. It not the best but it is a start. Tried my best to keep it different yet identifiable to the original mtg ones. They are attached to this post.

And what is the part field? I assume its for double sided cards and

silly flippable cards from Kamigawa too.