It can't be a random card from those boxes since it defeats the purpose of multi-elements being more rare than single elements. Since the cards themselves cannot be put into the vending or exchange NPC then have the box contain the 6* card corresponding to that element and level.
An example for a working variant in simpler terms:
1x g6 (lvl 61-70) single 4* card will get one coin for the corresponding element variant = 1x blue (ice) 1x red (fire) 1x black (dark) 1x green (nature)
We could say that you need 12x coins but that defeats the purpose and creates more hassle. Simply exchange 180 coins for a single element G6 card box corresponding to the coins handed in which represent the element that you receive.
If the player wants to exchange for g7(lvl 71-80) then the blue coin requirement would be increased to 260 coins. While a g8 (level 81-90) would be increased to 340 coins.
By lowering and raising the coin limit per exchange depending on the card level, we can avoid unnecessary clutter.
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g6 single element 4* = 1 coin (blue/red/black/green) to represent the elements
180 coins = box that contains g6* card box. the card box contains the element corresponding to the coins handed in.
260 coins = g7
340 coins = g8
I second this idea. We don't want to be farming our brains out for a card which turns out to be a different element. So the different coloured coins for the different elements is a good solution.
There are single element, dual element, 4 element, and 5 element.
Attack: single x 4, dual x 2, and 4 ele and 5 ele.
Resist: single x 4, dual x 2, and 4 ele
You would need 15 different coins for one grade to make the duals and multielement separate from the rest and thus, more harder to obtain as they are more gamebreaking.
Also just skipping the 5* will simplified things as most people would agree 5* is quite useless.
Edited by Infin1te, 04 June 2015 - 07:20 AM.
