Web-slinging (You may cast this spell for if you also return a tapped creature you control to its owner's hand.) Counter target instant spell, sorcery spell, or triggered ability.
原文Triggered abilities use the words "when," "whenever," or "at." They're often written as "[Trigger condition], [effect]." Some keyword abilities (such as prowess) are triggered abilities and will have "when," "whenever," or "at the beginning of" in their reminder text.