A lot of green decks are going to find ways to modify creatures (using the definition of the mechanic modify, of course), but in a pinch you can use Silkguard to modify them anyway
If they don't have a substantial board presence when you cast her, or cards in their hand that can take her out, they're stuffed: they can't go digging for answers
This makes sense when you consider that this is the only physical Command Tower printing with this previously digital-exclusive Adam Paquette artwork
In terms of the game, Vehicles behave just like regular artifacts: they may normally be played during your main phase while the stack is empty
It's also a theme that works generically, but just by building a deck that ramps and plays more late-game spells than other decks
The secret to printable results is boring: use high-res art, keep text away from the edges, and export at the correct card size