Any further damage to the same target this turn can be canceled by spending one Colorless Mana per point of damage to be canceled. Essentially, if you have a next turn win, this is the card that can help you get there, by making yourself the target
This makes it a superb land at any point in the game since you can play it tapped without a 1-drop on turn 1, or wait for turn 2 and have it act as a pseudo-Scrubland
Three cards in the cycle - Sapphire Medallion, Ruby Medallion, and Emerald Medallion, have a fair few cases where they were printed with the same press that did Peanuts comic strips
Being a lesson lets you fetch it with learn cards, giving black decks a neat wish target
Lavinia, Azorius Renegade Lavinia, Azorius Renegade sits in a strange place