Not a dealbreaker, by any means - especially if you use clear inner sleeves - but still worth mentioning
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Banned Penny Not Legal Toolbox Buy This Card Notes and Rules Information for Doomsday: If your graveyard and library combined contain five or more cards, you must choose five cards from among them
Kindred Discovery can help you draw a lot of cards so youll have no trouble responding to your opponent if you can establish your mana base and get this blue enchantment in play
Interestingly the payoff for accumulating experience with Aang is a bit of a nonbo with the above
It was already played in Legacy and even Vintage decks, which kept the card's price high while Splinter Twin, for instance, crashed post-ban
You can use it to save stuff from mass removal or targeted, protect something post-bounce, and a lot more