They are a crucial part of the game and you cannot win without them
6 Tiana, Restaurant Owner Legendary - $8.60 One of the better cards from the Azurite Sea set, Tiana, Restaurant Owner helps keep your characters safe with a strong taxing effect to keep the game swinging in your favor
More modern designs like Garth One-Eyed and O-Kagachi might be considered to fall in this category, but those legends have a little leeway to focus into other areas depending on how the deck is built and what definition you might consider for value
But this concept got its very own card out of sheer delight
Not only do you prevent the combat damage that would be dealt to you, but you get to have your Commander deal damage equal to its power to each of those creatures
The foil rate for those seems to be pretty low, though, which we can infer from the quantities available on card sites and the relative prices