While visiting my friendly local game shop, I bought one of the Space Marine Heroes blind boxes. Unlike last time, I scored the chase mini, the rare Brother-Captain Thassarius!
I have also found the meaning of the symbols on the card, and at the time of writing this post, the rules for the Space Marine Heroes Battle Game are here, or accessible through the Warhammer Community downloads page.
I won't be assembling this guy. While eBay Buy-It-Now prices are not a good measure, he does sell at a premium on the secondary collector market. I would rather find someone who wants him in his opened box condition. Comment below before this post pays out if a sale or trade interests you!