Undercity Sewers [Murders at Karlov Manor Prerelease Promos] SWSH039 Fusion Summon 1 Fusion Monster

Fusion Summon 1 Fusion Monster from your Extra Deck that lists that monster on the field as a Fusion Material Monster

Set: Dark Revelation Volume 3 Card type: Fusion/Effect Monster Rarity: Rare Attack: 2200 Defense: 1500 "Dark Blade" + "Pitch-Dark Dragon" Each time this card inflicts Battle Damage to your opponent

As long as Conqueror's Flail is attached to a creature

1 Box Topper card

Whenever Thalia and The Gitrog Monster attacks

Undercity Sewers [Murders at Karlov Manor Prerelease Promos] SWSH039 Fusion Summon 1 Fusion MonsterSet: Murders at Karlov Manor Prerelease Promos Type: Land Island Swamp Rarity: Rare (T: Add U or B.) Undercity Sewers enters the battlefield tapped. When Undercity Sewers enters the battlefield, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)