The card set including Metallic Entity was already under adjustment, but I apologize for not paying enough attention as we focused on releasing the demo within the scheduled timeframe.
Going forward, I will work on balancing so that overly powerful combos cannot be obtained too quickly through a small number of card releases.
I will also think about ways to prevent strategies where the Director (player) benefits from a strong combo while avoiding necessary restrictions on that attribute by banning only unrelated cards.