Help with magic?

Hello all. <3

OHBOY. Uh. I must have read the info on magic about five times and I'm still a tad lost here.

I'm really not sure how to edit/label/whatever Caulith's magic. Below, I posted his list of spells as they were written for NK and several other places. Feel free to suggest changes or tell me your opinions! (Just remember the point is they're supposed to be Corrupted with is why they may backfire.)

(Edit: If you're wondering about preps, they originally had them and were removed so I may get help on those too. Please do suggest prep times - although I'm not sure some of them would require any?)

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Types:
- Touch: Contact w/ target must be made
- Spoken: Short incantation must be used
- Instant: Just happens; needs nothing

Natural:
Biotoxin
Type: Touch (bite)
Summary: Natural substance in body; collected in glands in mouth & mixed w/ saliva
Symptoms: Prevents wound from clotting; high fever, fatigue & vomiting
Effect time: 2 posts
Duration: One to three days (unless healed)

Shifting:
Gender
Type: Instant
Summary: Switches gender

Appearance
Type: Instant
Summary: Becomes more human

Earth Magic:
Curse
Type: Spoken
Summary: Causes minor to moderate illness
Symptoms: Fever to flu; joint pain, nausea, aches, insomnia, weakness, dizziness etc.
Sacrifice: 5% of energy per use
Haywire form: Curses self
Effect time: 2 posts
Duration: One day to one week (unless healed)

Jynx
Type: Spoken
Summary: Causes minor to moderate misfortune
Symptoms: Varies; bad luck, clumsiness, confusion/disorientation, forgetfulness, impaired thinking/judgment, etc.
Sacrifice: 10% energy per use
Haywire form: Curses self
Effect time: 3 posts
Duration: One day to one week (unless healed)

Infection
Type: Spoken
Summary: Causes minor to moderate skin rot
Symptoms: Acts like an infected wound; instantly kills plant life
Sacrifice: 5% energy per use
Haywire form: Infects self
Effect time: 2 posts
Duration: One day to one week (unless healed)

Cancel
Type: Spoken
Summary: Cancels out previous spells
Sacrifice: 20% energy per use
Haywire form: Does nothing
Effect time: 3 posts

Dice use:
To determine whether or not the spell works, dice/numbers will be rolled with Random.org
* 1 to 50 = works, 51 to 100 = fails
Upon failure:
* 1 to 25 = goes haywire, 26 to 50 = nothing happens

To me it seems as if you already have everything all sorted out. In my opinion, you would put Earth magic as his school of magic (the level of his learnedness being up to you to decide), while keeping his poison and shifting powers in abilities (under natural and supernatural, respectively).
About the dice; While it seems that you have your own form of resolving issues, Skuldhellir already has a system. It might be best to just go ahead and convert, but I also suggest asking a moderator if you could be allowed to keep what you already have.

Ah, thank you! Makes sense to me. I'll go with that and hope for the best.