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A minor distinction, but an important one

Copying constellation cards like Setessan Champion and Archon of Sun's Grace gives you more of a good thing

Lands which circumstantially produce large amounts of mana are out as well: Cabal Coffers

Many stores and convention vendors buy cards for their own inventory, and you can often just walk in with your binders and boxes

Hes just that good

When you cast this spell, target opponent exiles the top four cards of their library, then you may put any number of land cards that player owns from exile onto the battlefield under your control. Because it considers all exiled cards, this means that casting this after some of the other cards on this list will get you a lot more than just the four cards it hits on its own