Just a suggestion. I don’t know if its good or bad. Could be great for players who wants to try out some of the troops that they haven’t got yet. If the player decide to level up/trait the troop in the week he loans the troop, the troop will stay like that whenever he/she decides to loan it again, as well if the player get the troop in a chest.
Costs for loaning a troop for one week:
Epic: 80 Gems
Legendary: 120 Gems
Mythic: 160 Gems
(All Epic-Mythics troops is available to loan for every player. I was thinking that only one troop can be loaned each week per player.)