"X-Head Cannon" + "Y-Dragon Head" + "Z-Metal Tank"Must first be Special Summoned (from your Extra Deck) by banishing the above cards you control. (You do not use "Polymerization".) Cannot be Special Summoned from the Graveyard. You can discard 1 card, then target 1 card your opponent controls; destroy that target.
What they are talking about is all but one of its pieces is an equip card that boost stats and blocks one death, with cards like peacekeeper and support maintaining said defense as well as helping you grab the pieces. On top of that you fill you fusion deck with it's fusions and you can destroy most cards with a single tribute.
ABC machine are better than XYZ. Those union machine monsters can negate spells and trap while increasing attack points when equipped to other machines. In the future. I'm planning to put two A union with one Z tank, two B-Busterdrake with one X Dragon head, and C union with one Y Head Cannon. I will be lucky if I will be able to fuse XYZ and ABC into A-Z Dragon Cannon. Unstoppable like Exodia.
The effect can be used as many times if you still have cards to activate it.
Awful monster. Another example of nostalgia-based cards taking a spot on the URs of the packs. If you have all those 3 monsters on the field you may as well attack for game, since their attack scores are enough to go over 4000.