Talk:Vitruvius/@comment-66.129.138.210-20141120235303/@comment-25151790-20141121011246

It's referring to the number of cards used to make HR Milk before amalgamating her with the HSR.

5 cards is the normal way of evolving by combining 5 0* cards until you reach the 4* card. 0* + 0* => 1* 0* + 1* => 2* 0* + 2* => 3* 0* + 3* => 4*

16 cards is the "perfect" way of evolving to get the highest possible stats (soldier count). 0* + 0* => 1* (8 times to get 8 1* cards) 1* + 1* => 2* (4 times to get 4 2* cards) 2* + 2* => 3* (2 times to get 2 3* cards) 3* + 3* => 4*

(All evolutions assume that all cards are at max level and arcana succession is used in each step)

This page has more information about evolving: Evolution & Amalgamation