[Manga-card Discussion] Number 77: The Seven Sins

? Level 12 monsters
Cannot be destroyed by battle except with "Number" monsters. Once per turn: You can detach 1 Xyz Material from this card; destroy all monsters your opponent controls, then attach all monsters destroyed by this effect to this card as Xyz Materials. If this face-up card would be banished, you can detach 1 Xyz Material from this card instead.