To put ,y two cents in I would keep the rare farms but I would make it so T50 actually lose the card when the spin comes around.
ie. I win a Trident from a T50, he/she loses that Trident.
Personally that would be my idea of how it could slow down rare farming as less T50 will want to lose their good cards.
Also I would make it that youget the card spin from only their deck they just used and if it is fully upgraded then you only have upgrades to spin from etc. In short you get exactly the card they have upgrade or not.
Just my ideas
Scyther
Aka, screw us people in the T50 over for just playing. Are you communist? XD
If I'm farming Gods, I don't want to wake up one day just to learn every single card in my deck is gone and I have to start from scratch simply because some guys got lucky and won all my cards. Those cards that I had spent long hours getting.
And even if it's just rares, I spent a long time farming T50 to get 6 of each. What if I'm just using a deck that uses 6 of a rare and flying weapons? It wouldn't be fair to lose a rare just because I'm using it in a deck.
How would that work anyway? If I'm using a 30 card deck and someone wins a card, since I don't have that card anymore does my deck become 29 cards? >_<
Finally, it isn't just the decks we leave when we're offline. Any time we're using a deck with an upgraded card, we would run the risk of losing that card if we had submitted our highscore. So you would be punishing us for being in the T50 since we would probably never use upgraded or rare cards. Or we would never submit our score, and then it wouldn't really be the T50. Maybe it could be renamed the "Bottom 50."