Haha, I tried most of those already -
Utopia Sprawl wasn't considered since I only run like 5 basic forests with no painlands.
Khalni Heart Expedition - was in there for a little while, would be useful if I used fetchlands, but I don't have them.
Cryptolith Rite was in there for a longer while (if Rith connects, I can actually produce quite a few tokens) but most of the time it didn't do much and it especially hurt when I was behind with no creatures on board.
Only Wild Growth is pretty good (above the "curve" for land auras) but pricey on MTGO.
What I need is stuff like Font of Fertility (enchantments, place lands into play or into hand) since the land auras are pretty vulnerable to land destruction (with the exception of Trace of Abundance which helps me protect a karoo land or something).