When your opponent activates a monster effect: Destroy 1 "Battlin' Boxer" or "Number" Xyz Monster you control, and if you do, negate the activation, and if you do that, destroy that monster, then you can apply the following effect.
Special Summon 1 "Battlin' Boxer" Xyz Monster from your Extra Deck with a different name than the first.. A list of Battlin' Boxer Yu-Gi-Oh! decks from the Yu-Gi-Oh! Card Database - ygoprodeck.com
The "Battlin' Boxer" archetype focuses on Battle Phase advantage and disrupting the opponent via the "Battlin' Boxing" counter trap card. The deck achieves this mainly by swarming the field as fast as possible to Xyz Summon their Extra Deck monsters.. Built around the boxing-themed monsters used by Alito in Yu-Gi-Oh! ZEXAL, the deck excels at maintaining field presence while applying constant pressure.