Oftentimes, it ends up being a necessity: a competitive Legacy or Vintage Tribal deck, for example, is running that tribe for a very specific reason, most likely to support a specific combo
The saving grace for all these cards is that they can always be cast for 1 mana to secure your next land drop, making them great early on without being embarrassing later
I know I didn't get to the Gotcha mechanic yet, but I will eventually
Since there are fewer common cards than uncommon cards (weird right?), Wizards designs the commons carefully to ensure there are fewer dead cards for your draft experience
If youre willing to exert four items, you can bring him out for free
It's a nice boost, one that can make for some interesting strategies if any of the six available items are still buried within the deck