Do The New Legendary Boots Have Enough Value to Them? Mastery Pack Guardian Flesh and Blood TCG What Are First Edition Pokmon Cards and Why Are They Valuable? SNKRDUNK Magazine Learning Flesh and Blood Guardian Master Class Intro TCGplayer Guardian mains this one's for you! Flesh and Blood just launched a brand new product line called Mastery Packs. These are booster sets that focus entirely on one hero class at a time.