"X-Head Cannon" + "Z-Metal Tank"
This monster can only be special summoned by removing from play the above monsters on your side of the field. You do not use "Polymerization" to special summon this monster from your Fusion deck. Discard 1 card from your hand to destroy 1 face-down Spell Card or Trap Card on your opponent's side of the field.
Atk 2400 / Def 2100