Number 23: Lancelot, Dark Knight of the Underworld [YZ07-EN001] Ultra Rare Effect Fusion Monster Set: Starstrike Blast Card type:

Set: Starstrike Blast Card type: Synchro/Effect Monster Rarity: Ultimate Rare Attack: 2600 Defense: 1900 1 Tuner + 1 or more non-Tuner Machine-Type monsters When this card is Synchro Summoned

change that opponent's monster's ATK to 0

all face-up monsters on the field are changed to Attack Position and their battle position cannot be changed

and if you do that

Set: Photon Shockwave Card type: Xyz/Effect Monster Rarity: Ultimate Rare Attack: 3000 Defense: 2000 2 Level 8 Normal Monsters Once per turn: You can detach 1 Xyz Material from this card

Number 23: Lancelot, Dark Knight of the Underworld [YZ07-EN001] Ultra Rare Effect Fusion Monster Set: Starstrike Blast Card type:Set: ZEXAL Manga Promotional Cards Card type: Xyz Effect Monster Rarity: Ultra Rare Attack: 2000 Defense: 1500 2 Level 8 monsters This card can attack your opponent directly while it has Xyz Material. When this card inflicts battle damage to your opponent: You can target 1 face up monster your opponent controls; destroy it. Once per turn, during either player's turn, when a Spell Trap Card, or another monster's effect, is activated: Detach 1 Xyz