Abzan introduces Endures, which grants creatures either bonus power and toughness, or creates new spirit tokens, while the Jeskai introduce Flurry, bonuses introduced if a player casts a second spell in their turn
Affinity isnt a deck that has done particularly well since the banning of Mox Opal, but its still got a lot of potential
Their original printings, from Onslaught, are up around the $70-80 mark (except for that nerd Windswept Heath, which is $55), but the versions from their first big reprint in Khans of Tarkir demand a much more reasonable sum, averaging around $30
In addition, Barrin could bounce multiple creature a turn if need be, clearing the path for one fatal attack
The average decklist makes up for it by including a lot of mana rocks (which accounts for the high number of two-mana cards) and turning a seemingly blind eye to the fact that so much of their mana ramp and color fixing could be blown away by popular cards like Vandalblast and Cleansing Nova