One card has always stuck out to me.
Restore
. But for the longest time i could never figure out how to create a deck focused around that card. I created a few concepts, one where it was a Gruul deck with land destruction, but it never really worked and i abandoned the idea. However, with the release of the new Commander decks, some cards started showing up with similar themes to land sacrificing. Titania, Protector of Argoth and Sylvan Safekeeper got me again on the path of making a Land Sac deck. Finally I've done just that. This deck ramps extremely fast into getting out Titania, Protector of Argoth or Avenger of Zendikar and then face rolling your opponent with plants and elementals.
T1: Forest -> Elvish Mystic
T2: Forest -> Harrow ->
Explore
-> Forest -> Sylvan Safekeeper
T3: Forest -> Titania, Protector of Argoth (returning the forest form graveyard to battlefield) -> Elixir of Immortality
T4: Various options are open now. You have enough mana to play Avenger of Zendikar or Conjurer's Closet and can start sacrificing lands to make elemental tokens.
Of course, this isn't what happens all the time but i have had similar results to this turn 4 or 5. Here are some of the main combos I've gotten off while play-testing.
Titania, Protector of Argoth + Conjurer's Closet. Lets you bounce a land from graveyard to battlefield each turn, giving you freedom to sac your lands with little backlash.
Titania, Protector of Argoth + Sylvan Safekeeper. Elemental Tokens.
Titania, Protector of Argoth + Avenger of Zendikar + Sylvan Safekeeper + Conjurer's Closet. Continuous Landfall.
Avenger of Zendikar + Conjurer's Closet. Lots of Plants
Of course, the non-basic lands also have good synergy with the deck.
Khalni Garden
Makes a plant every time it enters making it good early for blockers before they grow from Avenger of Zendikar
That's it for now, let me know what you think in the comments below and if you have any sugestions I'm always happy to listen. Cheers!