The rest was just commentary, and you wouldn't want to leave home without one or leave the draft without a bare minimum of two, and hopefully more
There's a hilarious game where pro player Brian Braun-Duin was playing Nadu at a Nerd Rage Games event and presented the combo, but his opponent was just like, "All right, combo off and kill me." And BBD proceeded to spend the next hour seemingly aimlessly looping through his deck
Dragon decks can definitely be built without it, but red is the most iconic color for Dragons decks and has some of the best tools
Gaining protection from everything can buy the player an extra turn, preventing all damage while also deflecting any spells or abilities that target players, from Thoughtsize to Lightning Bolt
Thankfully, it's actually pretty solid
Even in that format, however, it seems to slowly be becoming in auto-include in a variety of different strategies