If you need a break from Constructed, remember that Draftsim has so many sets to choose from and you can practice your build of Draft and Sealed decks
Each Foundations Starter Collection includes 26 Traditional Foil cards, 361 regular cards (including 90 Lands, 10 of which are Full-Art), 3 Play Boosters (each containing 14 cards), 13 double-sided tokens, 1 Deck Builders Guide booklet, 2 reference cards, 1 click-wheel life counter, and 1 card storage box.
1 Special Mythic Rare + 5 cards of rarity Rare or higher in every pack
Averaging just under $10, its likely at a short-term high point before the price bottoms out closer to $6
Since you have access to the best removal spells, it's quite easy to take care of creatures that could block Mazirek to ensure it gets in
Especially since the printings of Ragavan, Nimble Pilferer and Dragons Rage Channeler, the steal a casting cost 1 nonland-permanent mode has become very important and overall buffed the playability of the card