If you are interessted, I could send you an Excel Sheet with the Calculation, just pm me.
My data (and Calculation) is comming from 3 source files. “Deck.csv” / DragonEgg.csv and Dragons.csv, as you probably already now =)
I’m Refering here on the Icicle example send by @Br0n .
If you lookup Icicle in the Dragons.csv, you get the information that his egg needs 1100 Fragments.
Next step is to get the possible decks that are able to breed Icicle via a lookup in the Deck.csv.
For Icicle there are 5 possible Decks. The one that Br0n has choosen is deck3948, with Jul and Ursa as parents.
So if you look furher into deck3948, you see the information; “T9C3SFdragon:34|T9C3WIdragon:4|T9C4HIdragon:4” =>
Translated into Jul factor 34, Ursa factor 4 and Icicle factor 4.
If you now want to get the percentage/droprate of Icicle you just calculate 4/(34+4+4) = 9.5238%
The final cost calulation would then be 1100 / 9.5238% * 20 (as 20 tokens are the cost of 1 fragment) = 231’000 Egg Tokens
I hope that this makes sense to you. English is not my native language, but I hope that you can get the meaning behind my few words. Again, if you are interesset, send me a PM