While I had the same reaction when first seeing Jumbo Cactuar's unique ability for the first time, the difference between 40, 10,000, or infinite damage is fairly negligible when they all have the same outcome by the end of a Commander match
While a two-mana ramp creature is obviously less desirable than something like Elvish Mystic, Twitching Doll has the kind of upside a one-mana dork could only dream of
Right out of the box, the specific artifact theme is loud at 48 nonland cards in line with Daretti, Scrap Savant, 38 of which I would be hard-pressed to cut
Otherwise, you can combine Robin Hood, Daydreamer, with one of the new location cards featured in Into the Inklands to grant the character some additional protection from banishment - such as Pride Lands, Pride Rock, which gives an extra two health to any characters placed onto that location, or RLS Legacy, Solar Galleon, that will give the Evasive condition to any cards there: meaning that they cannot be challenged by any characters unless theyre also Evasive
Heck, the Moxen are so broken in concept that versions of them that would come out years later - like Mox Diamond, Chrome Mox, Mox Opal, and Mox Amber - have all proven themselves to be pretty broken as well
