Issues I've found with your deck:
1. You are at 96 cards. People do have decks that are these sizes but after looking at what cards are in there, I would assume to
call it a "pile of cards" instead of a deck.
2. Looking at the effect of each card, it seems to me you didn't even try and hastily threw whatever you had available together in the hopes someone on the internet will do it for you.
3. You say "I want to be able to effortlessly mill a 100 card library while being able to defend myself." You can't have everything. I've refined my mill deck 111 times as of this post and I still lose often.
4. Plenty of the cards in here are singular, meaning you only have one. The consequences of which are:
a) The deck becomes constantly random. The whole point of creating a deck is to minimise the randomness in a game of randomness.
b) If you were up against another deck that mills/destroys/discard, you'd have no backup plans because you'd lose the only one you have.
5. You don't have enough land. A deck should always have 40% land because all too often you will find yourself short that one crucial land.
I'm not going to edit it down for you, sorry. The cards would be yours but the deck would be someone else's. If you need guidance, check the internet for different combos and win conditions. You can look at my deck in my profile but DON'T copy it.
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