These are the support cards you can use to support your LIGHT machine fusion materials. Union Scramble is able to Special Summon up to 3 banished LIGHT Machine-type Union monsters to your Field, and can also be banished from your Graveyard to return 1 banished LIGHT Machine-type Union monster to your hand. Frontline Base allows you to Special Summon 1 level 4 or lower Union monster from your hand once per turn. Machina Peacekeeper is able to help you draw out the union monster you need from your deck, and can also act as a union support via equipping to your LIGHT machine-type monster as destruction fodder. B-Buster Drake acts as Spell immunity tech support, by equipping to your strong LIGHT machine-type monsters, and it also acts as a destruction fodder.
Fusion substitute cards such as The Light - Hex-Sealed Fusion, Goddess of the Third Eye etc cannot be used to Special Summon VWXYZ-Dragon Catapult Cannon, because VWXYZ-Dragon Catapult Cannon does not go through Fusion Summon process to be Special Summoned.
Although not impossible, it is quite unrealistic to summon this monster due to the current space format and meta deck that emphasizes on speed duels.
Restart Can be used after starting hand is distributed. Shuffle all the cards from your hand into the Deck. Then draw the starting hand again.
Armed Dragon Catapult Canon is arguably easier if you ignore Fusion Tag. You don't need both its materials on the field at the same time. (And once you do fulfil the conditions, you can Summon as many as you want.)
almost impossible idiot unless you against lv 10 duelist, you need xyz dragon cannon and it was mandatory, "as long as you always have VW Tiger catapult and 3 Fusion Tag" and this statement was invalid and stupid as you, 3 vwxyz, and 1 xyz, 1 vw in the extra, you need spell reclamation or other recycling card and that will make minus minus and minus LULZ
There's potential for a fun deck focused on summoning this guy. Just get VW-Tiger Catapult on the field and use Fusion Tag to treat another monster as XYZ-Dragon Cannon. Probably won't be consistent enough for serious competition, though, which is a real shame because this thing has great stats and effects.
XYZ and VWXYZ are the early release of union light machines. They'll get stronger on A to Z release in the future. That's when they can compete on serious competition that will overwhelm Cyber Angels and other traditional meta. Just like any other cards that were used used on the competition were weak too like XYZ because they had to wait for the new release to power up their cards to become meta.