One thing to note is that a lot of the drawbacks on older coin flip cards like Mogg Assassin are not such clear drawbacks in Commander
For example, mechanics like delirium on cards like Dragon's Rage Channeler care about having different card types in your graveyardan enchantment land adds two types all on its own, making it easier to hit that powerful threshold
If your Commander deck has two commanders, you can only include cards whose own color identities are also found in your commanders' combined color identities
As always the list is going to include a combination of cards I like, cards that are popular and powerful, and cards that are or have been historically important to the game
Regardless, outside of blue, I can see people trying this out
To determine the set, you locate the logo on the card