Due to the card's advantageous overuse in the popular decks featured in metagames Four-Color Adventures and Four-Color Ramp, the results of tournaments were too skewed to keep it in play in Standard format
Eshki and Surrak finally faced off, but he was no match for her skill
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
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
Bringing them back as non-creature enchantments lets you leverage lots of powerful abilities