Seph Baelzara
123 is the final count after some removals.
I don't know if I like Arc blade thanks to its cost, but I like that it keeps coming back every few turns.
Wheel of Fate, although slower, would probably be easier to get.
Curse of the Cabal doesn't seem too bad. It's a ticking clock for sacrifice effects, despite it being a touch slow as well.
I'm questioning if I should keep It That Betrays, Kozelik and Darksteel Colossus, but I'm already at 34 creatures, I'm not too keen on lowering this any more at the moment. Which leaves 53 other spells.
Bumped the lands up to 36 by adding another mountain and swamp.
Getting there.
it should be mentioned, there aren't usually sideboards in EDH games. plus, sundering titan probably not the best sideboard option unless you have some way to flicker him and just eat all the basics.
I wouldn't run arc blade in EDH. maybe festering march, but arc blade's very minor, and the countdown for the march will give your opponent the ability to play around it, plus it's also overpriced to hardcast.
curse is actually pretty bad. the fact that only one player needs make a sacrifice to stave it off for two rounds means it'll rarely come out of suspend, and hardcasting it is no. choice of damnations would be better for that goal.
you shouldn't be afraid of running a little creature light, especially if you're cutting out the high end of your mana curve. you'll usually have your general available if you need a body or beatdown. remember that.
you might try dividing your cards into effects, rather than types. removal, fatties, utility. more specific things liek sac outlets, sacrifice enablers, burn, whatever. figure out what effects don't have enough focus, or aren't worth keeping in the deck and cut them from the deck. also if you have a lot of cards that fit into one classification, you can consider trimming a few of them. that's how i set up my finished EDH decks when i want to add new cards, and when i post them as decklists, as 100 card singleton can be hard to grok.