They can always print a new batch of borderless cards with all-new art, but they cant (or, more accurately, wont) just print Lorwyn again
The Zealot even lets you sacrifice artifacts at will

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The Ancestors are the wisdom of the tribe and the soul of the Homelands
You won't find value in it every game, especially if you're effectively controlling the board with all of your direct damage tools, but if you find it at just the right time you can gain a two, three, or even four lore instantly, which is often enough to close out a match in a deck like this
Essentially, there isnt too much of a cost associated with playing the majority of Energy cards because such a wide berth of various effects have been printed that provide it