User blog comment:ShawnCN31594/Super Rare Fusion/@comment-5111059-20120612150643/@comment-5283714-20120712015220

The chart accurately tracks fusion costs. First, there is an assumption built into the chart that you are using level 1 feeder cards. So when you first start the S card is also level 1. The cost of fusion will be 200 for the first 17 fusions. Then the S is level 2 so fusion with level 1 cards will cost 300. Just follow the pattern from there.

However, this chart fails to account for opportunity cost of the N cards. Even if you use Child cards for every merge, that cost is 300*984=295,200. This puts the total "cost" up to 3,345,600.

Does anyone have growth percentages based on using level 10 feeder cards instead of level 1?