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Looking on the type line, we can see that he's a creature, and his specific creature type is "Troll Shaman"

When the last is removed, you may cast it without paying its mana cost.) Illustrated by Jeremy Jarvis Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp

This provides additional spells to cast while also providing flexible damage that can potentially be used to remove even more creatures and Planeswalkers from the battlefield

You can hurt yourself if you do it really badly or simply gain little to no value if done poorly