Burning Beast (DR1-EN071) - Dark Revelation Volume 1 Unlimited

Once per turn, during your Main Phase, if you control this monster on the field, you can equip it to your Freezing Beast as an Equip Spell Card, OR change it back to a monster in face-up Attack Position. When equipped to a monster by this card''s effect, each time that monster inflicts Battle Damage to your opponent, destroy 1 face-up Spell or Trap Card on the field. (1 monster can only be equipped with 1 Union Monster at a time. If the monster that this card is eqipped to is destroyed in battle, this card is destroyed instead.)