Just thinking, but the game seems to getting even buggier.
-R 7 Â shows up as the top entry when you you first click on base, but disappears when you sort, unless you sort by rarity.
-When you move a card our of your playing/active deck, the game does not readily release it (the 9 little squares in the lower left hand corner of your card indicating the card is an active member of your deck).
-When  you try a big up grade and/or with "big" cards into an R7 you get a "connection error" message. if you use lesser cards to make the upgrade - problem goes away.
-When you are in a battle - you get an out of cubes message till the next game communication (20seconds) Â but you clearly have plenty of cubes.
Just have a hunch....Card inflation is catching up Both on the programming  side, as well as the game integrity/balance. Card Inflation has bloated the game code, Three communication per minute with Moobs is no longer frequent or more data per communication needs to transfer. The games integrity/balance is out of wack  - in game boss battles are not paying out enough BC, and Medals, to keep up with Card and Boss Inflation. Rubies are seemingly worthless if you are a T2 player.
My imagination? Do we have a Game Crash or major fubar of a game upgrade on the horizon?