Quote Originally Posted by rufus View Post
My understanding is that a "tier 0" deck is a deck that is so strong that there are no viable counter decks. For example in this standard, it was turning into "play cat, or lose." Legacy tends not to be like that because the card pool is so big and there's a lot of potent hate available.
Magic still has a lot of variance though. It can take a lot of data to prove a deck is 55/45 against the entire field, and such a deck is tier 0. Wizards hides a bunch of that data, and given the tournament scene for Legacy lately, such information can be hard to come by. The truth is that for the players it's as much about perception as reality, though Wizards to their credit makes data driven ban choices.