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There are a lot of champions in the store and really, when I wish to purchase more than one, it is really quite annoying as you have to find the champion you want, hit the purchase button and then select payment method as well as waiting for the transaction to process on top of that.
What I propose is simple, a 'buy all remaining champions' feature that allows you to buy every champion you do not yet own, whether it be via IP or RP.
This feature would have to include sales, but probably ignore bundles. Perhaps also giving maybe a 10% total saving (RP only) or something to reward you for bulk buying.