I think there should be some sort of hero trading but like the trade has to be equal so people dont trade a sacrifice for a dove keeper or something.
thought it would cool to suggest.
For trading, do you mean like the one in Ballo event, a new mode or between players?
If it's between players, forget it. IGG said years ago that they would not implement it.
You would do a suggestion more complete; for example, on item shop add a exchange Hero mode (Hero or their card) where you can trade a Hero for a Hero Card or a Hero of the same value (Lvl. 1, 2, 3, etc.).
This exchange would be limited to a quantity and once or twice a week. A difference with the one in Ballon event is that you don't need to Lvl up the Hero, and can be trade regardless of their level (IGG decide if in this path player get back or not his resources).
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You have no idea how many folks tried to push this idea. I've lost count, but answer is always same: Nope!!
But we have something different but similar which is hero exchange during first few days of Being Festival.