Spending, essentially, four mana to exile your land, exile all graveyards, and pick up a Historic card before doing so, is an absolutely fantastic ability for a Utility land
Omnath, Locus of the Roil and Omnath, Locus of Rage are also potential options for Elemental Commanders, but both of them are more accurately described as landfall Commanders who also happen to like Elementals
Again, this card feels like a really strong sideboard win-con for matchups where you can pave a way for one copy to do enough damage that it will either end your opponent on the spot, or make it so they'll eventually deck out
Sea Drake and Illusory Angel can both be better but this requires some effort in design while the Efreet is just good all of the time
If that Army isn't already an Orc, it becomes an Orc in addition to its other types
Darksteel Sentinel