Any abilities that triggered when the ability was activated are put on the stack now
Fast red mana is so strong in Magic, which is why Mox Ruby is often among the most expensive of the Moxen
Then you draw a card when it ETbs, so even if answered immediately, you'll not be down a card
In terms of splashes: we need now Blue on turn one for our enablers, but also sometimes black if we want to cast Darkblast or discard spells from the sideboard, or white if Portable Hole is needed
She can be shifted on top of another Gadget card, bringing her cost to only four instead of six, and, if the player has three or more items in play, they can pay one less ink for any Inventor
in any deck that has reliable treasure production, this is a straight up win condition