donated-warroir-9 asked: I feel like what breaks rishdan port is that as a land, it costs no in-game resources and has very little opportunity cost in deck building. I contrast, a 5 cc red creature would be way more balanced. Not a developer, yada yada yada...

Not a developer, but you are seriously underestimating the annoyance of removing a land of opponent’s choice from casting spells in the main phase.