With how much card advantage it offers you, once you try Necropotence , youll never go back
You could always enchant it with Elemental Mastery and tap to make a ridiculously wide board
For the first one, a good example is MGs deck supporting relic barriers and howling mines as a card drawing engine and a semi-prison side strategy
Yes, youll have to pay some life too, but players start with 40 life in EDH and some commanders, like Oloro, Ageless Ascetic, give you a bunch of extra life to offset the cost
Just a few months ago a major speculator called me crazy for targeting copies of this in Europe for $160, but personally I think its crazy to not be targeting your first copy of this card before nearly anything else on the Reserved List