Board Thread:Questions and Answers/@comment-8132886-20130707153541/@comment-9839593-20130816082622

What Yakumoren said in ze last sentence can be grasped by insiders only: Dont just fuse like cards togehter: eventually I receive duplicate useful cards like yoto or Revvie. Now as I have no need for 2 Yoto or 3 Revvies (the really love me) I max every Yoto and Revvie and then fuse maxed revvie in to 1 Revvie!

In that case the probability of the Revvie to raise in skill is 1. If you just fuse a level 1 Revvie into your existing Revvie the probability of Revvie in raising skill is less than one! So of all the seldom cards just fusing them is waste cos there is a way to raise skill for sure.