This is a mono-blue EDH deck centered around theft spells and uses Thada Adel, Acquisitor as the commander. The primary game plan is to steal your opponents' good creatures and use it against them. Thada helps that along by allowing direct access to your opponents' artifact ramp and toolbox.
This deck has been one of my favorites to pilot. No two games ever end up the same since the deck plays completely different depending on your opponent. As a result, most of the time, this deck will automatically scale in power with your opponents. The more powerful their creatures and artifacts, the better your deck gets. It ends up punishing players for having too many answers once they start getting used against them.
Most of the time, I'll win through commander damage using my opponents' commanders. As a reminder, 21 commander damage from a single commander will kill a player, regardless whether it's your commander.
I needed the Tolaria West for another deck and I realized that it really didn't do much in this deck in the first place.
So, I completely forgot I had these cards from the Commander 2013 precons. Order of Succession gives me another option for non-targeted theft, which is great considering the prevalence of hexproof, shroud, and protection on key creatures. Lonely Sandbar should provide me more late-game draw and coming in tapped never harms this deck much as long as it can reach 3 mana and/or steal a Sol Ring.
Just some new changes to smooth out parts of the deck. High Market provides another sac outlet in case people try to steal their creatures back. Govern the Guildless gives me another source of permanent theft. It's a little costly, but it doesn't give the creature back. Roil Elemental helps me out late-game when I'm starting to run low of theft spells. Shapeshifter's Marrow should be an interesting add. I'll see how it plays out.
Twincast was removed since it felt out of place in the deck. Ornate Kanzashi just never hit anything good and given its high CMC, I never enjoyed used it. Helm of Possession looks like it fits in the deck, but I rarely have a creature to sac when I want to activate it and when I do, I've already stolen the creature through some other means.
Added: Moonring Island
Just wanted to add another utility land.
Removed: Merchant Scroll
I love this deck. Awesome build. +1...Just wondering, do you have any trouble with card draw? I have a very similar deck that needed tweaking and so i checked out yours, and noticed that you have barely any card draw. I had to add a few to my deck, just wondering how does yours do without it? I added just some simple draw cards like Divination , Ponder , Concentrate , and Otherworld Atlas , and i also added Leyline of Anticipation .
You know, I never noticed it before, but you're absolutely right. The deck certainly lacks draw power, but it hasn't really hurt me before. The reasoning being is the deck itself will slow down the game. Granted, if your opponent(s) have never played the deck before, they get thrilled that the mono-blue player isn't countering anything and drop the largest creatures as fast as possible... which you then promptly steal. After that, your opponents are much more hesitant to drop creatures, which invariably slows down the game to draw-go without you having to invest any mana. This gives you time to recover and draw more theft spells. A single stolen creature will generally last me until my next theft spell or answer. A repeatable theft engine like Vedalken Shackles, Beguiler of Wills, Memnarch, or Roil Elemental is even better.
That being said, cards like Ponder, Preordain, Brainstorm, and Impulse would certainly smooth out the deck's draws in the mid- to late-game, when land is less useful. The reason I haven't put them in would be because I haven't felt the need to do so. I win my fair share of games with this deck as is.
So to answer your question, I think it runs fine as is, but would certainly run better with draw/filtering. Why don't I do so? Laziness mostly, combined with an illogical hatred of staples like Sensei's Divining Top.
That Leyline of Anticipation is genius, though. I can't believe I didn't even consider that before. Instant speed theft would be amazing.