Actor
From Castle Wiki
An Actor is an object in a card, such as the player, a wall, a coin, a ball, or whatever you decide.
All actors are designed and created from Blueprints, but there can be many actors all using the same blueprint. Actors have a position in space, can collide with each other, and can refer to each other with Tags. For more information about the relationship between actors and blueprints, see Blueprint.
Actor-specific state
Although actors derive all their initial properties from their Blueprint, their state can change as the deck is played: