Number C105: Battlin' Boxer Comet Cestus (LD10-EN043) - Legendary Duelists: Soulburning Volcano 1st Edition

4 Level 5 monsters
If this card destroys an opponent's monster by battle and sends it to the GY: Inflict damage to your opponent equal to half the destroyed monster's original ATK. If this card has "Number 105: Battlin' Boxer Star Cestus" as material, it gains this effect.
• Once per turn: You can detach 1 material from this card, then target 1 monster your opponent controls; destroy it, and if you destroyed a face-up monster, inflict damage to your opponent equal to the ATK that monster had on the field.