higher level persists. if they're the same, it's random. if you wanna upgrade a specific variant of a card, mix it first with the same variant, then you can mix it with any variant with a lower level.
Damn it, I miss the 6.5.11 version! Does anyone have that version? Since Manyakis didn't keep the older versions, I decided to do it myself.
Anyway, here's the
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to the older versions. (By the way, how do you tag the other user on this site anyway? I want to ask ogrishTAN if he/she has the 6.5.11 version or not but I'm not used to commenting around here.)
Also, here are all the advertisements in the game of the current 6.5.12 version.