New Keywords from my set

Its only seen on a few cards, that are very powerful, and have effects that occur when in the Graveyard. My friend, who is helping me with it, thought that it might be too powerful having one in play and in the yard. Thus, Individuality.

Right, so I think you're going about this the wrong way. The fix here isn't to make an even more legendary version of legendary; the fix is to make the graveyard abilities less powerful. See Wonder, the granddaddy of "has a passive effect in your graveyard" cards-- that requires you to control an Island, so that you have to be playing blue for the card to work. Wonder is also redundant-- it grants itself an ability it already has, and if you have multiples in the graveyard it doesn't stack.

Notably, I'm not sure that being able to have one on the battlefield and one in the grave is the powerful thing about the first card-- it's that the ability is just casually very powerful. Notion Thief costs four mana to stick that ability on an incredibly fragile body.

(An aside: I don't know why individuality is even on that second card, when its ability means there'll never be one in your graveyard in the first place.)

I have to say first I read this I was confused.
I have to admit, I posted the Mythical supertype for a contest. Which is legendary for teams. However, that was just an extension of the legendary supertype into team play.

Here we have individuality. Which is an extension of the legendary supertype with the old ruling it had. Let me list the problems legendary had with the oldest ruling:

1. It's an all downside mechanic. Sure the other abilities the card has may make the individual card awesome, but the mechanic itself is all downside. Now, legendaries are awesome enough generally that people forget how bad the mechanic feels, but take the old Legend set or the Kamigawa set with legends. Some of them were not good and felt underwhelming or plain bad. Specially if the card was vanilla.
2. It creates dead draws. Which this time it is even deader draws. Sure you get an effect when it is in the graveyard, but now you just limited your design space. Cards with Individuality cannot have in battlefield effects that are too different from the effects they have on the graveyard. Otherwise you might get situations where you want one effect but cannot have it because you have the creature in the grave.
3. Leads to infinity game play. Now not only you cannot have any effects if you play the card. You cannot have any effects if your opponent play the card. Which leads to:
4. Encourages people to play them as answers. So, you have no way to deal with the effect a powerfully individuality creature? You can play a small mill effect and include the card. As soon as it hits your graveyard you deal with the creature on the battlefield. I mean people will be playing Individuality cards to answer individuality cards. Not because their decks want it to further their plans. This means the cards cannot be too powerful. Then why have them be Individuality cards?

I mean, legendary rule has changed so several of these do not apply to the legendary rule, but they now apply to your Individuality rule.

Finally, Individuality rule brings conflicting flavor. Similar problem to my mythical supertype. We already have a rule to represent individuals and that is legendary. You might have to find another way to name it.

Ok all. I need some help with the coding for a different new Keyword. The Keyword is Resurgence. The reminder text for it, as of now, is the rather clunky "When this creature is put into the graveyard from the Battlefield, do the following." I have Additional Rules in the Keyword tab saying "Resurgence — [effect] when CARDNAME goes to the graveyard from the Battlefield." How do I code it so that the Additional Rules is what shows for the actual text of the card?