Well, first off, if the goal of a Masters set is to make formats like Modern cheaper and more accessible, then Ultimate Masters is the best Masters set of all time
Rares are where you start seeing more powerful build-arounds, board wipes, pushed creatures, unusual enchantments, premium lands, and cards with effects that would be miserable if they appeared too often in Limited
Escape Protocol will be very helpful with Niv-Mizzet Reborn on the battlefield, allowing me to flicker him and get another 10-card flop for just one mana when I cycle another card
These decks are printed for beginning players, and the cards inside of them aren't really printed to be considered for serious competitive play
Find your favorites and join the fight
Rich Shay (Vintage Ringer) 8