cr:7.0.3d

If an effect states to “this chain link” it refers to the chain link that the source is on, or the active chain link if the source is not on the combat chain. As a time or duration, a chain link starts when it becomes the active chain link and ends when it is no longer the active chain link or the combat chain closes. As a location, the chain link is the respective collection of objects on the combat chain. If there is no active chain link (during the Layer or Resolution Step, or when the combat chain is closed) the effect fails to be generated.

Example: Flittering Charge has the text “If you’ve played an instant card this chain link, this gets go again.” which refers to the chain link that Flittering Charge is on and refers to it as a time. The condition is met when an instant card is played during the Attack Step to the Damage Step while Flittering Charge is on the active chain link.