There are 3 Free Cards with Easy Bank Pro. I was already at the limit of those 3 cards when I ordered my Metal card. This Month my invoice was 3,49€ higher than usually, with the "bunq Metal Card" being the source of the invoice.
If you pay 100€ for a card that card should exist outside the limit of 3 free cards, or it should make it absolutely clear while ordering that you should cancel one of your existing cards as this one will go over the limit.
There's literally no bonus to the Metal-Card other than the look&feel - the least they could do is exclude it from the card-limit of your plan...