Evilswarm Nightmare [LEHD-ENC35] Common

Set: Legendary Hero Decks Card type: Xyz/Effect Monster Rarity: Common Attack: 950 Defense: 1950 2 Level 4 DARK monsters When your opponent Special Summons a monster(s) (except during the Damage Step): You can detach 1 material from this card; change that Special Summoned monster(s) to face-down Defense Position.