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From MTG Wiki
The Art of Magic: The Gathering - Zendikar is an art book that was published by Perfect Square in january 2016. It is a hardcover with 240 pages.  
The book contains illustrations from the original Zendikar block and both sets from the Battle for Zendikar block, and 65.000 words of lore and story.
Plane Shift: Zendikar is a free supplement to The Art of Magic: The Gathering — Zendikar, designed to help Dungeons & Dragons-players take the world details and story seeds contained in that book and turn them into an exciting D&D campaign.