The basic premise behind this deck is fairly simple, cheap effective removals, paired with super efficient creatures. Aegis helps you maintain a board until Svetya can come down, Pacifier prevents weapon based removal from being overly effective, and you build a solid, resilient board of good to great creatures.
Very few of these cards would require any explanation outside of maybe the Kosul Brigade and Duelist blade:
Kosul Brigade - This card is just an efficient card across the board. Against non-justice based control decks or low to the ground aggro decks, eilyn's and vanquish can be sacrificed in exchange for getting 2 sizable creatures on the board; Otherwise, since 6 is the decks upper limit, mana is 100% sacrificial.
Duelist's Blade - Just a solid removal card that works with the meta decently, gives you aegis, and can often give you that cushion you need against aggro burn if they get you low (or Channel the Tempest vs Control). Just overall a great card. (Also removed enough in casting cost from the Pacifier that it won't conflict with the card as often as Auric Runehammer.)