You have to remember that some of these categories likely would have been started years ago. Which is before any of us.
Even my earlier edits (I only came back here recently) were 2 years ago or so. I'll try to answer a few of these, somehow I never got a notification for it.Some of them might just be examples how I have it on the DM/Kai wiki, and not necessarily answers.
I guess because because you cant really draw anything else, so "card" is implied. I do use "Card Draw" as the category on my wikis though.
I would actually say something that discards a card from your own hand would probably be a "Self Discard".
Sacrifice for me would be split into 2 categories, that first one would be the "Choice Removal" and "Self Removal" for the methods you mentioned.
I've mentioned about this one before, and I think I've even removed a few cards from it. I'm for the removal of each of them.
That is a bad discrepancy, and likely just due to slang.
Could probably fuse it easily if no-one has any objects. If its all cards that say "Prevent X damage", just pick what name you guys like more. Damage Prevention does sound better to me.
I don't have a good answer to this one. Or at least, a suggestion other than your "damage" for cards like shock that can target both. Lava Axe is definitely "Direct Damage".
I was about to say probably not, but the Rarity template would be making the categories for any set automatically for each card that is in a cardpage. So any of the Duel Decks will have one. Unless you were meaning stuff that doesn't have its own unique symbol (like an old theme deck).