There are dedicated Clone decks in Commander that run Clone effects, copy their Commander, and then run things like Mirror Gallery that suspend the Legendary rule
But that competitiveness is not what drives some players
BEST BOOSTERS FOR PLAYING WITH FRIENDS - Specially balanced for Limited play, grab 6 Play Boosters to build a deck and battle your friends in Sealed games, or grab 3 packs and pass them around to build decks in a Booster Draft
The bigger issue is that, as we talked about before, it's not just (or even primarily) Reserved List cards being counterfeited
One thing I want you to note, if you love buying Collector Boosters: These last three slots have some rough math
This 6/6 First Striker forces your opponent to make a choice, let you draw three cards, or take damage equal to the mana value of three milled cards