Collection power is very useful for going up and it's one of the things people focus a lot on during the last few days of the season. I suggest renting out a certain portion of the cards that you are not using to earn you some extra DEC. For example, I got a ton of duplicates and some of the gold foil cards are never used because I have leveled up cards. In this case, it's better for me to rent them out for some extra revenue.

Also as a side note, don't rent out everything. If you don't have enough collection power, you will automatically lower down your rank and that is never fun.

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