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 monster, and if you do, attach this card to it as material.
You can only activate 1 "Battlin' Boxing Cross Counter" per turn.