Question about General Questions Hand of Cards and Drawing Cards - What do both players have to take into consideration regarding the hand limit?
It is important for both the active and passive player to observe the hand limit at all times. If the passive player receives cards through events or actions performed by his opponent and thus exceeds his hand limit, he immediately must reduce the number of cards in his hand to the number allowed. Only then can the active player continue with his turn.
Note: This rule is valid for the old Catan Card game. The rule for the Rivals for Catan is different.