riot is there for if you don't get god hand. elongate the game a bit but i'd still expect to see at least 1 copy of both by the time i can play avacyn. if i can't, shuffling needs to occur. and it's not like you have a contract to follow their list down to the card. replace it if you want.
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i'd assume because fog is 1 mana and you only need to last till turn 3 if you have unlife and melira in your starting hand. after that you just ignore everything everyone else does until you avacyn/aegis and start swinging all out at everything that moves. at worst it'll be turn 9.
late game creatures if needed, idk maybe they're a lifegain deck and burn's not cooperating and giving me a sulfuric vortex. i find spells a more consistant means of hitting their face than creatures
late game large creatures if burn's really not cooperating, also if hit land pool and can't draw anything useful
personal preference really, an argument can be made for overall speed of the deck and it takes till turn 6 to work and that's just a mind grind at that point but really i didn't feel the need to put him in. you can always play around with it if you want.
that's the thing though, Having only one or two things that your deck can do makes it too susceptible to anti decks. My friends and I play often enough that we've made decks specifically to oppose each others decks. if there's no predominant strategy other than over power them, they can't do much to make an anti deck.