Mac Gerdts is a designer from Hamburg (Germany) known for using the rondel action selection system in a lot of his games. Most known games are probably Concordia and Imperial. Concordia also received a nomination for Kennerspiel des Jahres in 2014 and is still considered to be one of the best Euro games by many.
It’s no secret that deck-building is a favorite game mechanic of mine. Especially when it is done in a unique way. Judging by its cover Concordia could easily be passed as just another “trading in the mediterranean” game. It is not. Mac Gerdts, who is well-known for the rondel mechanism, has managed to combine deck-building, and hand and resource management into a unique streamlined game. He even switched from his trademark rondel to a card version of the rondel.