WALLS (Casual)

UNEXPECTED WALL DECK
A wall has defender, it means that it can't attack. That's not a big deal when it's time to drain opponent's life points, or is it?
This deck started as a personal challenge but it turned out to be very fun to play due to its low mana cost and its easy win strategy: it's basically an aggro deck, with.. walls? Yep, with walls.

OFFENSIVE STRATEGY
Everything hinges on Assault Formation: it's the key card of the deck, so it's massively important to have it on the battlefield as soon as possible. To increase deck consistency we need to draw as many cards as possible. For this goal we have 13 total cards (Wall of Omens, Wall of Blossoms, Angelic Gift and Harmonize), at this point should be easy to cast everything we need on the board pretty soon.
Even with Assault Formation we still have to pay {G} for each attacking wall: Overgrown Battlement does the job if you don't have enough Forests.
If gigantic flying walls aren't enough to win, have a look at Fell the Mighty: this white sorcery literally wipes all the opponents boards.

DEFENSIVE STRATEGY
Wall of Glare and Wall of Hope are the kings of our defense: the former is great against huge horde of creatures (goblins, elves, tokens) while the latter makes every huge nasty creature basically a life point source for us.
Tested against different decks, this creature combo proved to be extremely difficult to attack at any point in the game.
To be safe against cards like Mortify or Banishing Light use Rebuff the Wicked.

That's it. Have fun with your new wall deck and good Magic all!