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Yes it seems to me, that want reward them for buying booster packs - think it's impossible to come to champions league without buying booster packs or get cards from somewhere else (f.e. market). I just think, that they for season 4 gave normal cards as rewards and for level 5 only rewards cards - if it would be so than this would be another way for selling, because you get through rewards cards only one summoner (I think chances to get him are quite low) and so in the end you can use all rewards cards only at level 1 or you are forced to buy summoner cards, isn't it in this way ?

If I understand correctly then this is indeed the case. Because the reward cards pile up, but you need a summoner to play them. If you only have level 1 summoners in your deck you can play only level 1 reward cards, even if you have 50 of them...

Yes that's it. It's not important how many cards you have and to what level you bring them because of the summoner you can use only at level 1. I think many players will think than to buy summoner cards or booster packs. In my opinion system is that player can reach without paying money only silver level. To reach gold level or higher you should invest something and to reach champions league I think you should invest some hundreds of dollars.

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