Drop a big minion in the cemetery and using Raise Dead or Boneyard to bring it back into the game.
Seer, Browse, Dream Quest, Observatory, and Rivers can help filter through your deck to find the key cards you need to pull this off.
The non-big minions are all draw or tutor minions.
An early well placed Wizard's Den can trick opponent into attacking it allowing you to discard a large minion to reanimate the next turn.
Defensive spells, auras, and sites to stay alive until you can get some large minions on the board.