This is a delayed triggered ability, and it can be countered by effects such as Defabricate that counter triggered abilities
In addition to being a solid standalone Commander, Vial Smashers ability to pile on damage makes it a solid inclusion in Valgavoth, Harrower of Souls decks, which have even popped up in cEDH from time to time
65 square plastic sleeves will guard Dark Arts, Horcrux, and Encounter cards, while 70 large fit Hero, Turn Order, Location, Patronus, Villain, and Proficiency cards (135 total)
You can protect your collection by learning these authentication methods
I commend you for your build as well
The pull strips can come in three variations, either a vertical pull strip, a horizontal pull strip, and a gold-colored pull strip