Arena / Arena Store
Can the 5* and special arena give 900 battle chips with 3 victories.
Both 4* arenas 600 battle chips, the 3* and free arena 300 battle chips.
If we had an arena store we could purchase sig stones, units, characters (not just Punisher) etc. It would reduce the RNG if I wanted to purchase a crystal but short on units I could purchase (x) amount of units with (x) amount of battle chips.
Same concept as Loyalty and Glory store just another source of currency for players to look at spending.
Just an idea, I know I would do more arena grinding.