Even drawing ten cards in a format that powerful is enough advantage to end the game, but Ad Nauseum decks are generally capable of drawing even more cards before they need to watch their life total
Yiazmat is extremely difficult to defeat in-game, so since you went through all the perils of completing this sidequest, now your opponents have to go through the perils of battling this nearly indestructible ultimate boss
The artwork places Umbreon in an urban night setting
Whenever you cast a spell from anywhere other than your hand, Unstable Amulet deals 1 damage to each opponent
Just about every MTG set has a red sorcery that does one damage to each creature an opponent (or every opponent) controls - with an equipped Ghyrson on the board, that becomes a one-sided board sweeper (indestructible creatures, and creatures with protection from red or blue not withstanding)
For just five mana, Arvad gives you a 3/3 creature with two solid keywords, and, more importantly, a +2/+2 boost to all your other legendary creatures in play