Playing on Galaxy Tablet. Just won Alchemy Game. This got me to the next step on the Mastery Track which happend to award me a standard pack. I did not go and open the Standard pack straight away. Wining the game also completed the daily Spells event and tipped my gold over the threshold to buy another pack. So I went to the store an purchased a Mythic Pack. After this I went to the Pack expecting to find two packs and open them. The was only to Basic pack to open, the one from the mastery track. The Mythic Pack was not there, but the gold is now gone! Next time I will make sure I open all packs as I get them.