As a gigantic fan of mono white, I have searched for a while to find a good white commander. There are some cool options, but I wanted to find a general that was abusable, cheap, and preferably extremely utilitarian so that the deck can do without if it gets tucked, but is awesome to cast almost all the time. Mangara of Corondor seemed to fit the bill quite well, and, after getting her and Riptide Laboratory going while I was playing a Bant blink deck, I fell head over heels in love. She's still evolving, and, apart from a shell of good cards for her, the deck is quite customizable for your play style.
The main goal with Mangara of Corondor is to exile as much as possible. The part of her ability that exiles her is in the resolution of her ability, so if you blink/sac/bouce her in response to the ability, Mangara will be blinked/in your graveyard/in your hand, and the target of her ability will depart into oblivion. Quite a few cards in the deck are thus devoted to doing the above to her so that her commander tax doesn't get too high (although most games, she ends up around 7-9 for me) so that she'll remain a viable option for spot removal for you, allowing deck slots previously devoted to spot removal to be used in other ways. Now, since tuck effects are popular, still running someotherspotremoval is still in your best interest, but Mangara's RFG style of spot removal is pretty beast mode. Other than that, fill the deck with whatever you like best about mono white.
Personally, I like building the biggest pillow fort I can since the Commander games at my LGS tend to be pretty political and petty (hey, he killed my Primeval Titan so I'm not gonna stop until he's dead!). Remaining the last one standing simply because everyone else was too lazy to attack you is pretty much my idea of fun, and I like telling people it's not worth attacking me because they'll be left pretty much defenseless. Cards with Meekstone effects are pretty abusable too, especially because most of the best creatures in mono white aresmall or have vigilance, and a Blazing Archon with a Lightning Greaves is pretty boss.
Of course, most lists are going to devolve into mono white control, because white has amazing board wipes like Austere Command, Hallowed Burial, and Planar Cleansing, good pillow forts in the form of Crackdown and Ghostly Prison and friends, and removal for every permanent type. The issue then becomes winning. Like I said, I like waiting until everyone else has killed each other, but there are other ways. Token themes are always popular in mono white, and I have a few cards on that theme in my list such as Martial Coup, Mobilization, and Kjeldoran Outpost, and those do make Meekstone effects pretty cool. I'm sure there are some mono white combos that you could run too, but the only one off the top of my head is Crovax, Ascendant Hero and Near-Death Experience, and that isn't that reliable... Like I said, the deck is pretty customizable.
Must-Haves aka Mangara's Toybox:
Mangara's list of necessary cards is pretty short, and most of them are relatively good apart from her. The first category are cards that allow her to use her ability more than once in any given turn (without replaying her) and blink effects.
Thousand-Year Elixir is pretty much the best thing ever for a general with a tap ability. Use Mangara's ability the turn she comes into play and do it again? Yes please. The untap can be used while her ability is on the stack, and works well for stuff like Intrepid Hero and Weathered Wayfarer too. Your Mangara deck cannot go without it.
Magewright's Stone is Thousand-Year Elixir's younger and less amazing brother. Not totally necessary if you find yourself short on card slots, but decent nonetheless.
Mangara is also pretty nice with bounce effects. Unfortunately, some of the best of these are in blue (*cough* Riptide Laboratory *cough *), but there are still some decent ones in mono white.
Whitemane Lion, Dust Elemental, and Stonecloaker are all relatively decent creatures on their own, and save important stuff from dying nicely. Whitemane Lion is cheap, but that's about it, although that plus the bounce effect is usually enough. Dust Elemental has the distinction of being able to bounce itself too, and it's a decent beater too when it comes down to it. Stonecloaker is the best of the three, providing a cheap effect, okay evasive body, and graveyard hate in one awesome package, and can bounce itself, allowing you to spot remove cards in graveyards for 2W per card. All three should be in your Mangara deck, although Whitemane Lion is the least necessary of the three.
Erratic Portal is pretty much amazing for Mangara. It's cheap, reusable, recurrable (with Argivian Archaeologist), and super useful with anything that has a CitP ability or you need to save.
Sac effects can also be used quite nicely in Mangara. She can be recurred quite easily with cards like Karmic Guide, Sun Titan, Emeria, the Sky Ruin, and Revillark to keep her commander tax down, and it's generally good to run several anyways to foil steal and tuck effects. I try to run some of the better general ones.
Martyr's Cause is amazing. For one, it's free. Two, it foils a lot of Voltron generals since it doesn't even target, and three, it's an enchantment, which are the easiest thing for mono white to tutor.
Mangara does well with a few other cards in the deck too. Swiftfoot Boots and Lightning Greaves give her haste, which is key, since you don't want to have to sit a turn waiting for spot removal, especially in a multiplayer game, and Vedalken Orrery fulfills a similar purpose and lets you replay the Mangara you just bounced to your hand for more uses.
Creatures and Planeswalkers:
The above decklist includes several really good creatures, most of them pretty much just utility.
Intrepid Hero is sorta like a mini Mangara. It's not as useful, but since Commander decks usually run a bunch of big, angry creatures, this is a nice piece of spot removal.
Sun Titan is pretty much the best creature in the deck (and possibly in white in general). A lot of the cards were chosen because, apart from good abilities, they were titanable. Protecting and abusing this guy will win a lot of games.
Revillark and Karmic Guide are great recursion pieces in mono white. You'll usually have something to do when you draw one of these guys. They seem like auto includes, plus they infinite loop with a sac outlet. Blasting Station could be a decent combo piece with them if there was a reliable way to tutor the creatures in mono white.
Argivian Archaeologist is another piece of really nice recursion in mono white (or any white deck for that matter). Since mono white tends to rely on a bunch of artifacts, he's super useful, plus all the above recursion creatures get him back.
Preacher is being tested for funsies. I like him. He's probably not the best option, but he works with a lot of the Mangara enablers and is easily recurrable.
Mentor of the Meek is nice card advantage, especially with a general that can trigger him. Decent in most Mangara decks, and better in token builds.
Weathered Wayfarer is a good card advantage engine in mono white, uses a lot of Mangara's toys, and since this deck has a slight theme of abusing Land Tax effects, he's an auto include.
Mono colored decks tend to run a lot of artifacts, and this deck has a few more that are not in Mangara's toy box.
Sol Ring and Sensei's Divining Top: do you really need an explanation? Every Commander deck should have these. Crystal Ball is the second Top for this deck and scry is cool when you don't have a shuffle effect for Scroll Rack as you can put unwanted cards on the bottom of your library.
Memory Jar and Mind's Eye are both nice draw tools. Apart from Scroll Rack, they're the best draw we really have in mono white. Use them.
Crucible of Worlds, Zuran Orb, and Sunstone all work with the Land Tax abuse subtheme. It's hard to run out of land drops in this deck, so sacrificing them to gain life or fog is pretty good, but if someone ramps or you need to keep land drops going, you can.
Caged Sun and Extraplanar Lense both help out with mana production since you're saccing lands for quite a few effects, and the Lense allows you to keep fewer lands on table than your opponents while still keeping mana production strong.
Meekstone goes well with the pillow fort theme I have going. It's cheap too!
Expedition Map and Citanul Flute both provide some useful tutoring and shuffling. Neither are broken, but both are useful, especially since there are a lot of good utility lands and cheap utility creatures in the deck.
Oblivion Stone is a super useful, almost ubiquitous commander card. It's nice having a wrath sitting around waiting to pop, and is recurrable relatively easily. Almost an auto include in Commander.
Mono white tends to run a few enchantments, and this list is no exception.
Land Tax, as you may have guessed, is one of the best cards in the deck. It gives so much card advantage it's obscene if left for a turn or two, and can be recurred. Use it!
Mobilization is a nice source of creatures and a decent mana sink late game. It tends to make its way into most of my mono white lists.
Oblation and Return to Dust are just the best catch all spot removal in their categories in mono white. Oblation can tuck pesky generals and can net you cards when you use it on your stuff (like a token from Elspeth, Knight Errant for example), and Return exiles bad enchantments and artifacts either at instant speed or two at a time. Both are good.
The base of any deck, lands in a mono colored deck have two distinctions: they're usually cheaper than the manabase for multicolored decks (yay!) and they can include more utility lands as a general rule.
Karoo and Kjeldoran Outpost both allow you to keep your land count lower than your opponents for Land Tax fun. Outpost also provides a stream of cheap, useful, tiny dudes, which is quite nice.
Mistveil Plains is an amazing utility land and also happens to be a plains, so it's easily searched up. It produces white mana too, not colorless, making it a near auto include in white decks.
Ghost Quarter is my head nod to the fact that land destruction is necessary, especially when your opponent has a Cabal Coffers or Gaea's Cradle going. The Quarter, however, doesn't decrease their land count for, you guessed it, Land Tax, and generally makes them less angry at you for taking away their annoyingly large amounts of mana. It's in here over Strip Mine so people won't be mad for me running Strip Mine with Crucible of Worlds and is here over Wasteland because color screwing basic land light decks is funny and Wasteland is expensive for a poor college student who just spent a bunch of money buying the rest of the deck. Perhaps this spot would be better used by the Dust Bowl sitting in my binder though...changes may be in order...
Mouth of Ronom is sweet removal with a snow base. It takes out a surprisingly large number of utility creatures, and is recurrable removal.
Scrying Sheets is here because of the snow land base and because white needs all the card advantage it can get.
Kor Haven is nice for preventing dying. It targets (which is sad), but it can stop your face from getting bashed in by a large Lord of Extinction or something similar. If I had (or had the money for) Maze of Ith, it would probably be replaced.
Mono white is bad at ramping lands, but tends to have a lot of them in hand. Terrain Generator sorta fixes this issue. Nice card. Lots of fun. Does work.
Mangara of Corondor seemed to fit the bill quite well, and, after getting her and Riptide Laboratory going while I was playing a Bant blink deck, I fell head over heels in love. She's still evolving, and, apart from a shell of good cards for her, the deck is quite customizable for your play style.
Silly nitpick but Mangara is a guy, aside from that I love this decklist and wouldn't really know where to begin in changing it, it looks so good as is. Good job.