I agree that a big part of the game's fun was trying out different types of decks. Now if you upgrade cards, you kind of lock yourself into a deck. And if you do change deck type, unless you've already got all or most of the cards already for the deck you want to try, you sink a big amount of your cash into getting the cards necessary for your idea. Someone suggested simply making cards sell for the same amount they can be bought for, and this seems the simplest and easiest way to get back some of the versatility that was there before v1.1. Or beta could be reimplemented for those wanting to play around with decks.

A much better option (imo at least), but one much harder to implement, would be rather than buying upgraded cards, you buy upgrade slots, which you allot to cards you want to upgrade. Then, if you want to change your deck, you empty those slots of cards that are going out of the deck so you can allot them to cards in your new deck.

I'm playing a False god game atm (Scorpio - death mark and water pillars) and he put out 3 sapphire towers and an abyss crawler in the first turn, and ends his turn with 3 death and water quanta in his bank. The problem is, abyss crawlers cost 5 water quanta to play, so he generated 5 water quanta from his 3 sapphire towers in the first turn. More likely it seems to me that the card though listed as costing 5 water quanta actually costs the same amount as the unupgraded crawler, which costs 3 water quanta. Please post or bug report if you've also noticed this.