I do not know what people consider a low amount of mana ramp... I thought 10% of the deck as ramp or mana storage effects was solid. This does not include the Urborg and Cabal coffers combo. I wanted Lili of the Dark Realms but didn't think I could justify it with only 6 swamps and 1 swamp shock land. If I can get the other 2 swamp shock lands she is a possibility. Sword of Feast and Famine was a late cut for this build and it would be nice to put back in but not sure what to cut for it. I would love to grab opinions on what to cut for it. 13% of the deck is card quality and an early Thassa helps push down the big fatties so that you can draw into the ramp or more lands. Eventually I should invest in the G/B and the G/U fetch lands and replace Evolving Wilds and Terramorphic Expanse as they are more efficient. Finally there is Ydris himself. With more big fatties in the deck, when you cast a thumper... you are more likely to hit one with cascade. When Thassa out and is not a creature it is very difficult to get rid of him and Ydris becomes unblockable turn in and turn out. Whatever free card you cast with cascade is a ramp in and of itself. You can not count of Scroll Rack or Sensai's Top but if you have one manipulating the cascade can be fun. Thicket Elemental, Moldgraff Monstrosity and Sheoldred also provide card advantage similar to Ydris which ramps up the battlefield. I don't know if this is just the games I played but when I had the original Kruphix build if I hit two ramps early it made me a target just for the potential I could drop a turn. I find it better to slowly ease into the ramp and let other people be targets than try to hold on by the seat of my pants and pull a win out of nowhere.
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I am a little late to the party but I think you should add Dragon Throne of Tarkir as another win con. Throw Demon of Deaths Gate on the throne and all your apostles are 10/10 with trample. Yes I would include Kozilek Butcher of Truth instead of the Elixer of Life. He recycles the graveyard plus you get a body and card draw. I think you might want to run bloodgift demon as well. He is searchable with your apostles and starts your sanguine bond/exquisite blood combo. Fitting with your Demon Theme the flip card Elbrus the Binding Blade/Withengar unbound. You have enough flying evasion for it to go off plus you can always put it on Harvester of Souls to force a block on his deathtouch.