Effect: Show each other 1 fusion monsters from the fusion deck. You can send 1 a card named monster fusion material from your own card set to the cemetery. This card will be used as the card with the same name as the monster sent to the cemetery until the end. This effect can only be used in 1 turn 1 time.
This card is a startup effect and can only be used in the main stage. Of course, it can't be used in the preparation stage ... only in the main stage.
When using, select an additional card set and a fusion monster, and send the fusion materials in the card set to the cemetery. Before the end of this round, the prism man will be used as a card to send to the cemetery.
For example, in the sword fight beast card set, summon the prism man, activate the prism man effect, select Caesar the sword fight beast in the extra card set, and then send the sword fight beast gun bucket from the card set to the cemetery. The prism man can be a gun fight before the end of the turn, so you can use the prism man+any sword fighting beast to return to the deck to summon Caesar.
Thank you, WLJ, Wang Laojie for reminding me that the example of Wulong has been taken, and the fusion card group is not used much, so I take it for granted. ....
Supplementary answer:
Adjustment: ◎ [◎【xinyuxia/レィンボーネォス Hong Guang] When recording fusion materials with incomplete names, only fusion materials with detailed names can be selected and sent to the cemetery.
◇ [F G D] and other fusion monsters cannot choose to show this fusion monster. Although they have recorded fusion materials, they are all materials with incomplete names.
Does your extra deck have a specific fusion monster? It must be registered materials, that is, the specific name of the fusion monster must be pointed out before it can begin. For example, people with absolute zero degree, monsters with "heroes" in their names and water monsters can't be counted, because monsters with heroes in their names meet the requirements, so they can't be started. But Caesar, the sword fighting beast in the above example, can only throw a gun and then use his name as a sword fighting beast, but not as other sword fighting beasts, because there is no detailed name.