It's been compared to the classic card Tinker, and the comparison is neither that accurate nor that far off from the truth
In terms of flavor, these legends represented unique individuals, so it made sense that you couldnt have multiples of them in your deck
Creatures (36)
Wizards confirmed the mechanic had been designated deciduous, meaning that we should expect to see it show up intermittently to lend flavor to new sets
There is estimate to be no more than 100-200 of these in existence, and because of that, they go for around $7,000-$10,000 each
However, the real power of this Deck lies in your ability to swarm the field with monsters, including your opponent's field if you have "Clockwork Night"/"DNA Surgery", because more monsters means more ATK for "Machine King"