I see that many people have been trying to come up with some sort a combo deck with Griselbrand but I think that a new take on an old classic would be the most optimal way to make him work. A reanimator deck that could win as early as turn one, and I don't mean have a big fatty out on turn one, I mean swing for lethal on turn one. Here is what I have been testing and I have to say that I think with some tweaking or further testing, it can be rather good. It's fast and pretty versatile. You can be greedy and try to get Griselbrand and Emrakul both into play in the same turn and swing or you can go for one or the other depending on the situation. Here is the deck list;

4 Entomb
4 Cabal therapy

3 Goryo's Vengeance
3 Shallow Grave

3 Emrakul, the Aeons Torn
3 Griselbrand

3 and 4: [Lotus Petal, Chrome Mox, Mox Diamond, Dark Ritual] <- needs more testing to see what is the most optimal acceleration

4 Careful Study
4 Daze
4 Brainstorm

3 Underground Sea
2 Island
3 Swamp
4 Polluted Delta
3 Scalding Tarn
1 Verdant Catacombs

As far as the acceleration goes I have been testing Mox Diamond and Lotus Petal which is rather very good when Griselbrand is on the table and you don't have any mana open, however dark ritual can be justified as well because turn 1 -> dark ritual entomb -> reanimate can be pretty devastating. The Chrome Mox and Mox Diamond are pretty much the same in this deck IMO just because you don't really want to play either until you have Griselbrand on the table and then by drawing a ton of cards you can play either by discarding/exiling cards that are no longer needed. Chrome Mox can be slightly better just because there are only 16 lands but again, it all comes down to further testing. Anyways let me know what you think.