To get back to this topic, I think there is a far better way to do Survival Mode

Players pay a fixed entry fee to enter a round of Survival mode, for that entry fee they get a set of random Max Level Monsters and Summoners they can use in Survival mode. With those cards they need to make decks based on the game rules and face opponents with a similar win-rate. Each time they lose a battle they lose all the cards from that battle and they can continue to the point where they no longer are able to field a team or to a max number of wins. The cards that they play with are supplied by players who own the cards by locking them on land and in return they get part of the entry fee as 1-click passive rental earnings. After each run players get some rewards based on how they performed and at the end of the Day / Week / Season there is a leaderboard to give extra rewards in a fair way.

I made a full breakdown of the current flaws and the benefits of doing it differently here