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It changes the entire meta into something completely new that you cant go back from without banning every card in the set

In the case of copying a permanent with gift that already exists on the battlefield, no gift can be promised whether or not the gift was given when it was first played

While the power level of this land is indeed high, and could perhaps be higher on the list if we just looked at pure power, I cant in good conscience put it any higher because its so easy to abuse

And then when it, or another Nightmare or Horror arrives to the party, a target exiles cards from their library until they exile a land, which suggests exiling milling

Take the Mountain as an example