I'm not even sure he'd visit Earth if he could—we don't have the kind of game Garruk is looking for. Elephants, tigers? Whatever. Small potatoes. Unless you count the stuff chilling out in the fossil record, we just don't have anything that'd challenge him.

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Planeswalkers Unmasked
https://web.archive.org/web/20190328210651/https://magic.wizards.com/en/articles/archive/savor-flavor/planeswalkers-unmasked-2007-10-24