Although we dont need its combat abilities, Brainstealer Dragon is a 6/6 flyer, so its heading for the Red Zone
Meanwhile Red has access to a lot of targeted artifact hate - Manic Vandal, Ingot Chewer, and Oxidda Scrapmelter - and White has primarily access to the enchantment hate - Dawnbringer Cleric, War Priest of Thune, Wispmare
Each Mystery Booster: Convention Edition booster pack contains fifteen cards: fourteen from the gigantically awesome main set, and one from that "something new and surprising" group of R&D Playtest cards
Enablers Mana sources Interaction Cards you need for reanimation, token support, ETB creatures and the like are up to you and should be your creativity
No one had dared to face the Dragon for many an age
Some stores have surplus on certain sets and will pass on bulk from those entirely