Rule · Chapter 3
cr:3.0.9
If an object enters a zone that is not in the arena and is not the stack zone, or a public object becomes private while it is not in the arena, it resets - its previous existence ceases to exist and it becomes a new object with no relation to its previous existence.
Example: Endless Arrow is played and during the reaction step, Snapdragon Scalers is activated to give it “go again.” Endless Arrow hits and returns to the player’s hand (a zone outside the arena) and therefore becomes a new object. If the player plays Endless Arrow again it will not have “go again” because it is a new Endless Arrow card with no relation to its previous existence.