For those of you who don't know about the Alamo WFB GT or where to find their rules here is their wording exact:

"Hero and Lord choices (and only Hero and Lord choices) may use the ward save provided by Magic Resistance (and only the MR save) against the following spells that do not otherwise allow saves: Pit of Shades, the Dwellers Below, Purple Sun of Xereus, Final Transmutation, and the Dreaded Thirteenth Spell. Note that this save does NOT stack with any other Ward Save they have."

http://alamofantasygt.com/rules.php