Curve Deck

The SHIELD agents all generate cards that will fill in your curves. 

Quinjet makes all the generated cards cheaper.

Maria: 1 cost + quinjet = free

Coulson: 4 cost and 5 cost + quinjet = 3 and 4 cost

Nick Fury: 3 random 6 drops + quinjet = Three 5 costs

Agent 13: random card + quinjet = 1 less

Jubilee: lets you play chaves early so on turn 6 you can play a discounted 6 drop and some other fillers

Quicksilver and Domino: gaurentees you have a turn 1 and 2 and also makes drawing your card generators more likely, or you can save them for later turns to fill in energy usage.

Chaves: Mainy for Jubilee.

Nakia: Buffs both your SHIELD agents and random cards.

Psylock: lets you play more of your random cards. 

Sentinel: Just a filler.