Karn was a golem created as a probe by Urza to enable his time traveling experiments. His form was chosen because Urza's studies had shown that only silver could pass through temporal energies unharmed. In an effort to make the golem fully sentient, Urza included a heartstone as part of his construction, allowing him to develop a personality which would grow and evolve and make decisions on his own should the need call for it. Over his many adventures, Karn has indeed done just that and eventually became a planeswalker and ruler of his own world. Karn is a peaceful being, and preferably a pacifist by nature, the very picture of a gentle giant. We do not yet know why he has returned to Dominaria, but I suspect we will find out soon. You can learn more about Karn here: https://mtg.gamepedia.com/Karn

Karn is a major character in Magic lore and important to the Return to Dominaria storyline. Should you take this role, you will be asked to reprise him in future stories.

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