One game I tried to be extra conservative with my cards in order to avoid this problem, but by not playing many cards early on, my opponent was able to quest without consequence and gain a huge early lead
But it does the same thing for everyone else, because symmetrical effects are always fair, like Balance or Upheaval
If you believe you have a card that falls into that category, check eBay comps to see if a similar card has sold in the past 3 months
Also, it's a shuffle effect for things like Brainstorm, Sensei's Divining Top and Scroll Rack
This category includes cards that you cant even cast from the command zone, like Phage the Untouchable or Haakon, Stromgald Scourge, or grandeur creatures that ask you to play multiple copies in a singleton format (Tarox Bladewing, for example)