Pendulum Trap (Yellow)

“When this defends” is an event-based trigger. Whether the attacking hero has played/activated a reaction is checked at the time this resolves and becomes a defending card (i.e. defends the attack). If the trigger condition is met only after this resolves, then this does not trigger.

This effect is not optional.

If there are 2 or less cards in their deck, put all the cards in the deck into the graveyard.

If there is no attacking hero (e.g. this is defending against an ally attack), this does not trigger.