The $10 t-shirt deal of the day over at Teefury today is the Thor – Super Mario Bros. mash-up called “Now That’s a Hammer, Bro!,” by artist Spiritgreen.

The sale at Teefury began at midnight EST (Monday, February 21, 2011) and will continue for 24 hours from then, and once it’s over, it’s gone from the site for good.

The design features one of the Hammer Bros., a Koopa from the Super Mario Bros video game who throws hammers, dressed up in Thor attire wielding the mighty Mjolnir.

The limited-edition t-shirt is available in Men’s and Women’s sizes in black.

Of the design, the artist said, “The power of Thor. The persistence of a Hammer Bro. Finally the red plumber meets his match! (unless he has a 1UP and a Hulk-sized mega mushroom handy).”

What do you think of this design?