A Ritual Spell Card is a type of card used in the Yu-Gi-Oh! trading card game. These cards allow players to summon powerful monsters known as Ritual Monsters by performing a specific ritual. To activate a Ritual Spell Card, players must have the required materials, usually including a specific monster and a certain number of additional monsters or points. When a player uses a Ritual Spell Card, they typically follow the instructions on the card to summon the desired Ritual Monster from their hand or deck. This adds a strategic layer to the game, as players must carefully plan their moves and manage their resources to effectively use these cards.