Can you automatically remove cards to summon xyz dragon cannon or vw tiger catapult?

Question

Or do you have to have a helper card?

Answer 1

you must have a helper card or you cannot summon xyz dragon cannon or vw tiger catapult.

Answer 2

yes you can remove them right away. but remember they have to be on the field. you can remove them if they're face-down also (so you can summon xyz dargon cannon if z metal tank is face-down). i think you can also summon them if one of the monsters is an equip card (with its union effect)

Answer 3

Yes, if you have the required fusion monster for it you can immediately choose to remove it from play to summon the desired monster without any helper card eg. polymerization.

Answer 4

yes u can but u need to summon them one at a time