Right off the bat, Narset is a notoriously difficult commander to deal with, having both hexproof, so your opponent can't target her, and first strike, making her more resilient in combat
Either way, I enjoyed writing about it and researching some fringe EDH cards Id never heard of
Propaganda and Ghostly Prison make it harder to attack you as it also requires mana payment to do so for each attacking creature
The card you open in a pack is not a signal of what is open, and generally the second card is a pretty weak signal if it can be viewed as a signal at all
In fact, by casting something like EphemerateEphemerate on our beloved MechanozoaMechanozoa, we'll get double its effect as it enters two times, while also cancelling out the downside of the warp cost