"Play it from the graveyard" taken to it's logical conclusion.

Vesuvian doppleganger deserves special mention due to not working like other copy cards. I forget the exact difference and I don't use any of the other copy cards. Read the errata carefully.

Couple combos worth mentioning:

Kokusho-VesDop-Reya lets you do a consistent 5 damage to all players and gain that much life every turn. Great for large multiplayer games. Under new legends rules M14+ you may select which instance of a legendary creature you control dies, but it doesn't matter here. You can still select either the real Kukusho or the VesDop copy. VesDop only needs to enter the battlefield to copy a card, as reya does... not be "played" or "cast."

Another is SymWurm-Woe-Reya. Turns a 7/7 big stomper into 7 much harder to block 1/1s. Then repeats with each turn. Not as impressive as most infinite token combos... but helps shore up this deck's low creature count.

Another is Woe-ThornbiteStaff. Attach the staff to Woe, then tap Woe for it's "destroy creature effect." When that creature hits the graveyard Woe immediately untaps and can be used again.

Yet another is VesDop-PhantomNishoba. You can re-copy Nishoba with VesDop at the beginning of each upkeep. This has the effect of restoring the VesDop copy of Nishoba to 7 +1/+1 counters with all the benefits that implies.

Other notables:

Buried Alive is your go-to for filling your graveyard with creatures.

Leave Wonder in your graveyard at all times to give all your creatures flying.

Use Living Death as a reset if an opponent manages to wipe your creatures or as an early "I win now" play.

Think tank keeps powerful creatures from ending up in your hand (where they are unplayable).