The first step in solving this puzzle is to identify the names of the games from which each of the cards comes. The pictures are in alphabetical order, and the represent the games CODENAMES, GUILLOTINE, MONOPOLY DEAL, SKIP-BO, SLEEPING QUEENS, SUSHI GO!, and UNSTABLE UNICORNS. Each of these names is a unique length, and they can each fit into a single row of the grid as shown:
There are only two columns which cross the names of all seven card games. One is the nonsense string “OGODOOE”, and the other is the answer BICYCLE.