It's still a lasting reason for players to be concerned when facing off against a known Superfriends deck as the Big Bad, but against other decks it's probably a scheme that can be ignored unless a very strong one exists in the Archenemy's deck
This asymmetrical ability can counter everything from Force of Will to legendary spells cast with Jodah, the Unifier s triggered ability
Note, that while technically more expensive, buying the four pack of boosters is still more cost effective as you ultimately save on delivery, and that would probably be my recommendation for anyone looking to pick up a few packs without any stress
If you only mulligan away Astounding Revelation (in a standard 33 card deck) and nothing else: Chance you open with no copies: 96.9% With 1 copy: 3.1% With 2 or 3 copies: 0% This is because if you happen to get no copies in that opening hand, you mulligan nothing, staying at 0
And deck-builders had so many tools to break Stasis