Number 18: Heraldry Patriarch
2 Level 4 monsters
Once per Chain, during either player's turn, if 2 or more monsters with the same name are on the field: You can detach 1 Xyz Material from this card; choose 1 monster among those with the same name, and destroy all other monsters with that name. While this card remains face-up on the field, your opponent cannot Summon monsters with the same name as any of the monster(s) chosen for this card's effect. If this card is sent to the Graveyard: You can send 2 "Heraldic Beast" monsters from your Deck to the Graveyard.