Game objects, typically cards, have icons or other identifiers that identify them as belonging to specific categories. These tags may trigger special effects and/or have values and meaning that can vary, even within the scope of a single play. Tags are additional parameters on top of the base meaning of the game element, so tags represent a means of coupling the game element with more mechanisms and systems. Tags are also bookmarks that can reference a variable set of possible rules that are encoded elsewhere, so tags are also a means to modularize, or uncouple, game triggers and game effects.