I still think you might consider [casthaven]Slobad, Goblin Tinkerer[/casthaven] or [casthaven]Daretti, Scrap Savant[/casthaven] when building this type of deck, but [casthaven]Pia Nalaar[/casthaven] has a place in those decks, and can make a legitimate argument to helm it as well
Suddenly, you have one lord and a bunch of middling creatureswhich isn't going to be as effective as you might have hoped
When you glance across a table and see two counters on a 1/1 creature, you have a very good chance of knowing that it's a 3/3
Then, with some careful planning, a creature will be forced to block Vastra and be destroyed, creating a Clue and a Food
Eject, Cornered by Black Mages, Ice Magic, and White Auracite are all good examples of cards costed well above comparable spells in other sets