Garruk's got an uncanny understanding of the animal mind. It's unclear how he knows what he knows, but this gift certainly benefits his control of creatures and his hunting. He might throw out a little spell to tell a beetle to fly away, or to encourage a bird to come impale itself on his spit for dinner. (Sound unsportsmanlike? Garruk doesn't share your citified squeamishness.) His gifts are most obvious when he uses his most common tactic: summoning some of the beasts native to whatever plane he's on for use as sidekicks and hunting pets.

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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