I moved all of my rentals to the native game when they launched that feature, so I don't think I can answer your questions. I used to use PeakMonsters, but it got to be too complicated for me. The interface inside of Splinterlands is really smooth but probably not as powerful for those wanting advanced features.
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I added a heap of rentals today, the big cards get snapped up right away and my DEC intake for all these cards lying around doing nothing has gone skyward. There is a lot more demand.
That is awesome! I never would have imagined my deck could be worth what it is right now.