These are the height of unobtrusive enablers
Some of the best cards that work with Vial Smasher include those that add extra damage for your spells, like: Angrath's Marauders Guttersnipe Solphim, Mayhem Dominus 5 General Kreat, The Boltbringer A Powerhouse In The Command Zone A lot of Goblin decks revolve around getting out a ton of tokens or by dealing tiny amounts of damage either all at once or over the course of the game
The key takeaway here is: If an MTG card has several types, everything that affects one of its types affects the whole card
However, you can always use cards with cycling like Lrien Revealed at the end of your opponents turn to fetch a card, and, more importantly, exile the card on top of your library to play it on your turn with no restriction
As for what it does, thats hard to tell because it literally doesnt tell you