Mark Tedin elected to illustrate the two Phyrexian Boon pieces as one continuous mural. Check it out:

Art by Mark Tedin
You can see how it was split up on the two cards:
The card Serra's Boon from Planar Chaos, as Matt Cavotta reported earlier, contains a particularly close art homage to the left half of Tedin's Phyrexian Boon art.
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