Blaze, let no one stop you.
Of course, no one would like to see the game ruined by developers greed like most multiplayer games. But I would like if we could have more updates / cards, so if Zanz could have EtG as his main project, I believe it would be positive.
Alternative art is something good to give as "reward" for donations. Selling Nymphs also dont look so bad to me, as they usually arent so game breaking. Problem is to have REALLY game breaking cards for sale, something like a 9/9 for 3 quanta, a spell that costs 2 quanta and replenishes your hand with cards from your deck, etc. You could buy these cards directly for a lot of money, or have a small chance to get them from boosters in bazaar. Now, this would be bad.
Another thing Im thinking about is a type of Premium account. The game doesnt have much content to have it, but we could think about some advantages like:
+ 30000 (or another ammount) electrum; a complete set of rare weapons (upgraded?), some special art (when there is some), a Nymph / Mark at your choice, an extra oracle spin each day, maybe a discount to upgrade cards (1200?), and why not, a Trainer mode? I mean, you may have access to any unupgraded and upgraded cards, like in the trainer, and you can use them (maybe just for PvP), in games for your account (the electrum, cards you get are for your account), but you cant sell them, and they are stored separatedly of your real collection. Well, something to make the start more fun, and the progression faster, but without hurt the game.
Well, the game has potential. Some more advertisement could also increase the profit, bringing Zanz to it more frequently. But lets see if hes interested.