Of course, it's a little more like a 2.5 card combo, because you do need some way to deal that single point of damage after assembling the two cards, but there are a myriad of ways to do so in the format for zero mana that are already excellent in the deck
Now, Yu-Gi-Oh Master Duel is addressing a particular loophole with the card crafting system
This isnt useful in any situation other than wanting to gain a lot of life, or occasionally kill someone off, but if you can get enough mana, then you can sometimes win a game outright without even really trying
Upgrades to a class can only be performed as a sorcery, meaning during your first or second main phase, unless stated otherwise
Monster Effect: You can only use the 1st and 2nd monster effect of this cards name once per turn