Mark! I need to tell you this: I sat down tonight to play a commander game with Vrondriss as my commander. I've upgraded the precon with silver-border cards and with Painiac and Chaos Dragon, I was able to swing a 24/24 Steel Squirrel to one of my opponents! We lost to the combo deck, but I don't care, it was worth it. I love rolling dice with uncards. =D

Unstable has some powerful cards when you start regularly rolling twenty-sided dice.

Mark, I'm worried about the future of die rolling. I feel like now that d20 are a common die, the potential for designs like Steel Squirrel has evaporated. If you go back to using d6, you can no longer do a scaling payoff on the result, since d20 will break the cards. I feel like backwards compatibility was damaged because of the decision to use d20 here.

The biggest impact is we’re less likely to say “whenever you roll a die” than “whenever you roll a six-sided die”.

Mark, if Proper Laboratory Attire is equipped to a Steel Squirrel, does it still get +x/+x on the die roll higher than 5?

Yes, because the effect isn’t targeted and thus not prevented by the protection.