I suggest including more options in the filter of the cards, like rarity, or a very common ability: inmunity.

Im a collector and most of cards I bought are Rare, very rare or super rare, and I miss this option.

Hello! In the next update the market will include new opcions.
You can buy cards of a particular level.I leave you the link where you can see some images of what is to come.
rolplay.com/index.php?option=com_kunena&...Itemid=0&lang=es