Board Thread:Questions and Answers/@comment-33129788-20180104174017/@comment-33703237-20180111182754

It cost less to farm the 30AP exp card (silver card also count as 1 Mana prism ^^).

You can also burn 3* Servant and CE you get from fp summon ... but well, it's really if you already have them NP5 / mLB.

(I prefer burning my 3* CE to exp another CE).