Mono White EDH starring the best legendary creature, Avacyn, Angel of Hope! As soon as she was spoiled I knew she would be my all time favorite card. She plays well in Control, Voltron, and Aggro, and that how I play her. It's a sprint to eight mana, then bombs away!
Originally this was a budget deck lead by Konda, Lord of Eiganjo to prove to my playgroup mono colored EDH could be effective. Once Avacyn was spoiled, Konda's days were numbered! Even more effective in a Voltron deck, Avacyn's ability to grant Indestructible to everything you control allows you to play a fair amount of control and make every bomb you play one sided.
This deck went from being one that proved mono colored EDH deck could be powerful to my friends to being a deck my playgroup is afraid to go toe to toe with. Nobody says monowhite is a weak choice in EDH to me and makes it through a game against this deck with their opinion intact!
When I play this deck, it's almost always against ramp, so more often than not my opponents are tapped out by the time I rush Avacyn onto the board. The large amount of mana rocks and non basic lands have helped Avacyn make a turn 4 appearance many times. When playing against Control or Permission, set up is more important than playing Avacyn as soon as possible to insure she stays on the board. Heavy control is really the only true foil to this deck. That being said, the current meta of my play group has geared the deck towards it's current build which has several strategies to ensure victory!
Avacyn works best when she gets out and starts swinging. Voltron is her best mode, and is more than a handful against other Aggro or Voltron decks. She does need the right tool for the job however, and reliability is key. Stoneforge Mystic and Enlightened Tutor are key to searching out pieces, and are cheap enough to sneak in while playing your other set up cards and combo pieces. Cards like Land Tax and Weathered Wayfarer help ensure I hit all of the land drops I need, and Planar Portal takes care of the rest. My favorite play is a haymaker, attacking with Stonehewer Giant and Avacyn then activating Giant's ability to equip Worldslayer to any unblocked creature. Worldslayer is the most glare inducing card in the deck.
As long as everything I control has Indestructible, all of my bombs will be one sided. So Control is much easier to play, considering cards like Armageddon and Catastrophe hand me the game on a silver platter. Planar Cleansing and Akroma's Vengeance take care of everyone else's board, and Nevinyrral's Disk becomes repeatable and extremely oppressive. The rest is the best of White's best spot removal, Path to Exile, Swords to Plowshares, Disenchant, and Aura of Silence for things I need gone before I start my next turn.
As for making sure things happen the way I want them to, I have several ways to ensure nobody can disrupt my game plan. Creatures like Grand Abolisher and Iona keep my opponents from playing spells they need, while others lie Angel of Serenity and Elesh Norn keep my opponent creatures of the battlefield. Among the most important are Leonin Abunas and Fountain Watch. With such a heavy emphasis on artifacts, this creatures are especially relevant in the face of the heavy amount of spot removal in the meta of my playgroup. The most effective combo in the deck is one that leaves my opponents wide-eyed, and is just about insurmountable. Cards like Leonin Abunas and Indomitable Archangel only protect artifacts, but alongside Mycosynth Lattice your entire board gains Shroud/Hexproof. There's not much you can do against someone who's entire board has Hexproof and Indestructible!
Many of the pieces also serve multiple purposes. Mycosynth Lattice allows me to cast anything with my plethora of mana rocks. Enlightened Tutor can get me the equipment I need for a finishing blow, or an enchantment I need to lock down the board with the Hexproof everything combo. Elspeth and Silverblade Paladin provide big pumps while also providing blocking. Over the years I've honed the deck down to only cards which provide myriad facets of usefulness. The only vanity card in the deck, The Tabernacle at Pendrell Vale, is uniquely useful while Avacyn in on board to save my creatures from the wrath of what appears to be a church or something.
The rest is all about pumping Avacyn to 11+ to reduce the time she has to connect to score a kill. Silverblade Paladin and Ajani, Caller of the Pride grant the all important Double Strike, and Elspeth, Knight-Errant and mana doubling Gauntlet of Power/Caged Sun provide free pumping along with other benefits. Loxodon Warhammer gives Trample, and Godsend exiles blockers while pumping Avacyn up to 11 power while Sword of Feast and Famine/Fire and Ice provide too much value to exclude even if they don't quite push Avacyn to 2-hit killing range.
Try the deck put for yourself, and see the power! This deck is my baby, and has come a long way from it's first iteration as Konda Goodstuff. If you've every doubted the power of Mono White in EDH, or if you need to prove something to other doubters, you've found your deck!