This official Greater than Games promo card was announced by author Patrick Rothfuss on his blog in November 2014. The character Kvothe is originally from Rothfuss' Kingkiller chronicles series of books.
All sale proceeds are donated to Heifer International, a charity that helps people raise themselves up out of poverty and starvation by promoting education, sustainable agriculture, and local industry all over the world.
From the Official Website
What ho! Kvothe Six-String enters the multiverse as an alternate hero to play as with the Argent Adept hero deck (contained in the expansion) based on the character from Patrick Rothfuss's Kingkiller Chronicle. Kvothe Six-String has different powers and abilities than the Argent Adept to add a new twist to the game.