I think the trade harbor should have:
-the possibility to make creature for creature trade like rare for rare or super rare hybrid for super rare hybrid. Counting the ferocity of the creature, you can only trade a creature of the approximate same ferocity
-The possibility of trading for a locked creature as in option when you do the custom trade, even if it double the price of the creature
-The possibility of choosing the rarity of creature(if you have enough resources to exchange with)
Add your wish for the trade harbor here!