Tenacity

When Braum came out, it came to everyone's attention that there aren't many tenacity items. I would like more tenacity items and it'd be nice if you'd add tenacity to some of the health and armor items. It'd also be nice to have tenacity added to runes and mastery pages especially for new champion coming out. For her ult, it'd be nice to not only be tanky, but tenacious otherwise, I fear her ult may hurt more than it will help. Those are my thoughts, what do you think?