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-2 Golgari Keyrune +2 Izzet Keyrune You need to find door asap. So get all the was to get them. Once you get to three land you're set so 21 is a decent number, 24 is a little overkill. 4 Izzet Keyrunes will help you cycle out cards to find. I actually think this is a hilariously great idea. Do it!
while Hellkite Tyrant would be an interesting win condition keep in mind he only has 26 artifacts so using hellkite tyrant would rely on him either getting out most of his artifacts by which point he probably would have Door to Nothingness out and be able to play it or his opponent would have to have some artifacts which is not guarantied on his side board however would be where i would put it