Belle - Inventive Engineer and Maurice - World-Famous Inventor were never really playable outside of casual decks, and Scrooge unfortunately seems to be more in their vain of card than of the Hiram Flaversham - Toymaker type of item based character
Lands already has access to this combo thanks to Thespian's Stage, and it's much easier to set up because they can simply Life from the Loam both pieces into (and back from) the graveyard
Every Commander deck will typically have answers for this sort of play-style, as it's also the one that Kaalia of the Vast or a token-matters style deck will open as well
A: Only for cards worth $80+ raw
Kyogre & Groudon LEGEND tended to be too slow to get use in a serious deck, but if you somehow got both halves into play with the necessary Energy, spamming Mega Tidal Wave could finish a game if the opponent lacked a good answer
The alternative commander is Elsha, and though I believe she doesn't really work in the command zone all that well in this precon, I can't deny she does make a huge difference when she enters play