Crush Card Virus Errata. The most recent errata of this card most likely prevents players from using the. After light and darkness dragon has lowered its atk to less than 1000 with its own effect, tribute it to activate this card.
So if you activated crush card virus on your infernoid opponent, you are pretty much letting them search their deck for the card that they want to summon. Crush card doesn't even see play in lair decks because the errata sucks so much. Your opponent destroys all monsters with 1500 atk or more on their side of the field and in their hand and deck.