Emzed - Fertile Thicket Is quite terrible in this deck and in many games I've been looking to replace it. Opal Palace and Golgari Guildgate haven't had any issues in the deck, though I can understand what you are coming from. The reason I haven't added any of those lands is just the fact that I didn't have an extra copy of some of which on hand, or I don't care for any of the said land. For instance, I would totally run a Strip Mine, Rogue's Passage, or Shizo, Death's Storehouse, however I just don't have any extra copies. The other three lands that you had listed never really impressed me and the thing is, it isn't the way I wish to play Jarad, I am not one to make it all about him and just throwing in creatures to sac.Exhume has actually been perfectly fine in the deck, actually considering my local meta and all. The other three cards suggested just don't impress me more than Exhume other than Life/Death, so I will possibly consider that one.

As said earlier, I don't play my deck to be %100 about Jarad's main ability as I once did play the deck. Very few creatures in this deck are just sac fodder for Jarad or other engines in the deck, as I would like to have more utility out of my creatures. I have been highly considering throwing in Geth, Lord of the Vault and Necrotic Ooze I just don't have any copies but I'd really like to drop the Lord of the Void that is currently in the deck, I have not had any luck with it at all in the many many games I have played with this deck, and had gotten it out on the field. Thank you for your comment though, any help is appreciated.