Hannes Hi 👋
For a premium membership you can have both 3 plastic cards and 5 online cards included. These are separate type of cards.
If you remove 1 physical card it will make space for 1 card regarding the monthly costs. As it will be your 4th card within your membership as in production costs bunq will ask you for a one time production fee of 9€.
This information should be in a clear overview when ordering a new card, before accepting.