Like all other UR cards, this particular Rare Candy card has a gold holofoil and border, giving the card a sense of prestige and exclusivity
crs2806 didn't specify if this deck is better at going first or second at the start of the duel
In most situations, protecting Contain!, and Extinguish is the most important, as the two cards can shut down your opponent's plays.
Celtic Guardian has learned many new abilities, including one that lets you draw 3 cards, then discard 2 cards
It reveals the deck's theme as classic Jund sacrifice shenanigans, with the extra wrinkle that you'll be killing off your own lands and then replaying them from the grave
Iona is banned because she can lock a mono-colored player out of the game all by herself