Downloading ManaRocks 1.0 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The actual developer of this free Mac application is Rockgames Ltda. The software lies within Games, more precisely Strategy.
From the developer:
ManaRocks is a digital card game called Seasonal Card Game. On SCGs, the set of cards changes every season, creating a new experience and meta for the players. Everyone starts each season with the same basic cards and unlocks the remaining through playing and evolving.
You may want to check out more Mac applications, such as County Fair, Styrateg or Sally's Studio, which might be similar to ManaRocks.