How would you change cloak as a mechanic
It's especially strong in EDH, where you can use the ability to blast Sol Rings, Mana Crypts, or just stick it to the biggest artifact creature around
Not Grafdigger's Cage against Dredge out of a Collected Company deck
In any case given the requirements of a singleton deck its unlikely that Tazri, Beacon of Unity will end up as a particularly powerful commander, but I think this card will see play, and possibly show up in the 99 or at the helm of some party tribal type decks, or potentially as the leader of class-based tribal decks, there are a number of strong Warriors, Wizards, Clerics, and Rogues
Getting them graded can definitely help prove your cards are legitimate, but youll still need to back up their worth with quotes from other buyers, PSAs price guide and other sources when negotiating to get the best deal
You'll need a good stack, more than the 1,000-piece linked above, but 100 per color will get you off to a comfortable start