Originally Posted by chillinfar

Just see card list as EvilAngel mentioned above, you will notice that event Gacha has a N card not present in N or R Gacha. Old event cards are also available, but they doesn't affect multiplier (i like redhead from old guard event but i will pick her later, is too similar like a local slut in my land)

Old R and SR affect the multiplier (Akie Ibara and Kira Tejima).
I know that for sure,my multiplier incrased when i lvled them