Their durable construction means your cards will be protected no matter how often you play or how intense the competition gets
You can shave off the cost of the tutor nicely by having a fattie in play
Today, there may be more efficient options, and Flash was such a powerful card that it was even banned from Commander due to the problems it caused in cEDH
Another thing to be wary of with counterspells in general although most notably with Actual Counterspell is that you can easily fall behind if relying on them as an answer to things
If you want the absolute closest real-card feel The most authentic result overall requires: Black-core paper (the same type used in real card manufacturing) Laser printing , not inkjet That combo gets you closest in terms of stiffness, snap, and texture but its a completely different workflow and not inkjet-friendly
It can only be done at sorcery speed, which is fair, but it's so good in Shilgengar, Sire of Famine