Seven Sacred Stars [Avacyn's Angels] (EDH / Commander)

My take on Avacyn :)

This is a rather slow control deck with a heavy Angel Tribal theme.
Your first goal is to ramp up with cards such as Sol Ring, Worn Powerstone or Knight of the White Orchid, then Solemn Simulacrum, Thran Dynamo or Gilded Lotus later into the game.
Pearl Medallion, Oketra's Monument and Urza's Incubator are here to decrease the cost of your spells and angels in particular. Weathered Wayfarer, Land Tax, Oreskos Explorer and Endless Horizons ensure you get a land drop every single turn. Endless Horizons is huge especially late game when you can just exile all of your Plains and draw into your spells without the fear of getting a land one third of the time. Early game though, limit yourself to exiling between 5 and 10 Plains only, so that destroying Endless Horizons seems less worth it (and handicaps you less in case it does get destroyed).
Next, survive with single target removal (Swords to Plowshares, etc.), by detering opponents to attack you (Archangel of Tithes, Kor Haven), or by playing board wipes.
Reload your hand with Mind Stone or Hedron Archive (or Arch of Orazca if you're really desperate), play some angels to trigger Vanquisher's Banner and cycle through the deck.
Once you're comfortable, drop Avacyn, Angel of Hope and protect her via Swiftfoot Boots, Mother of Runes or Grand Abolisher.
Unless things went horribly wrong, you should reach a moment where you are able to cast a board wipe with Avacyn by your side for a massive swing.
One of the main combos you may want to achieve is to do this every single turn with Nevinyrral's Disk or Worldslayer.
Remember: as a slow deck, politics are your best chance to win! Kor Haven can protect an opponent from an attack; Arcane Lighthouse can help an opponent dealing with a threat; Homeward Path can help everyone gain control of their stuff again. Use these cards to strike deals with other players!

Note: This list runs Iona, Shield of Emeria and Armageddon, two cards that will make your opponents mad at you for playing them (mine are okay with those and even find them 'funny').
If you wish to keep your friends, swap them with less broken things. Otherwise, you've been warned!
My go-to replacement for Iona is Chancellor of the Annex, which also counters plays, just in a less obnoxious way. It even does something if you happen to have it in your opening hand (basically increasing the mana cost of each opponent's first spell by 1, which is really good for tempo). Other contenders would be Reya Dawnbringer, Exquisite Archangel, Resolute Archangel, or any other angel really.
As for Armageddon, I suggest another board wipe card such as Rout, Day of Judgment or Cleansing Nova.

Good luck and have fun! :)