User blog comment:Kelerik/2014-06-26 4 Million Users Campaign, New Cards/@comment-99.235.12.229-20140627150849

So it is

Demon Twins is the  2x AW dmg

Kappa is from  Relics

Penny-Wise is the 5x AW dmg

Fallen Samurai is the 10x AW dmg

Hanako of the Toilet is the AW

Multiple Eye is the FAW SR

Jodie Explorer is the Free card

Kiyohime is FAW UR / evo & amalg

Nureonna is from Ranking Rewards