So you can sacrifice opponents' lands now? Good to know.

Whoever you are, Visitor, could you be more polite in your comments please? Also, it'd be more polite if you could fill in a name so that we can address you directly.

This could indeed be cast on opponents' lands (or moved onto them). You wouldn't be able to activate the last ability, since you can't sacrifice something you don't control; but many players won't realise this.

So I think although the card technically works, many players will misplay it. This can be averted by either saying "Enchant land you control", or adding something on the end of the activated ability, either "Activate this ability only if you control enchanted land" or "(You can only activate this ability if you control enchanted land.)".

I can't really remember why I decided to make an aura that references Lake of the Dead, but certainly the idea was to make a terrible card in the mold of Evil Presence and just give it some other marginal use. As black is technically no longer supposed to get this style of ramp, it's doubtful that I should bother trying to revise this.

That said, adding additional rules text would probably be most appropriate, in lieu of something like a Warmonger-style ability.

Well, it's not really "ramp" at the moment, as it costs 4. It's more a way to save some mana from one turn to another. In that respect it's like Basal Thrull, and seems fine. It's still a pretty bad card :P