Sound the Alarm (Red)

Sound the Alarm triggers when it resolves on the stack and becomes an attacking card against a hero. When this triggered effect resolves, that hero must reveal their hand. If an attack reaction card is revealed this way, you may choose to do the optional effect of searching your deck for a defense reaction card, reveal it, then shuffle and put it on top.

If you choose to search your deck, you may fail to find a defense reaction card. If you do, you will still shuffle your deck.