XY-Dragon Cannon (SBC2-ENB21) - Speed Duel: Battle City Finals 1st Edition

"X-Head Cannon" + "Y-Dragon Head" Must first be Special Summoned (from your Extra Deck) by banishing the above cards you control. Cannot be Special Summoned from the GY. You can discard 1 card, then target 1 face-up Spell/Trap your opponent controls; destroy that target.