Your reward for completing the mission is 36 Wonder Hourglasses, 12 Pack Hourglasses, and 10 Shop Tickets
These two cards really only function in red and green decks, respectively
You can get an aura that protects Zur early so that it's harder to deal with him once he really gets going
Some were more important than others: For instance, Stinging Barrier was a first pick in its block, since the block was slow, creatures had low toughnesses, and low powers
The first of these is called Paradox, and lets you put a +1/+1 counter on a target creature whenever you cast a spell from anywhere other than your hand
Spellslinger/Storm Spellslinger decks cast lots of Instants and Sorceries for value, using them to draw cards, remove threats, copy spells, make tokens, or slowly bury the table in triggers