Note that if Body of Knowledge is dealt lethal damage, it dies before the cards are drawn, meaning they won't raise Body of Knowledge's toughness in time to save it
The popularity of Hammer Time is a boon for Mill, as the total mana value of that deck is incredibly low, which lets Tashas Hideous Laughter win the game with only a little help from the rest of the deck
It can be hard to find what youre after since there are multiple Mystical Archive variants, but TCGplayer can show you listings from multiple stores across the country, giving you plenty of options to choose from
If you chose another creature as the target, that creature also gets every ability of the original creature that is printed below backup until end of turn
A number of decks over the last week or so, including Gods_Shadows 5-0 League list above, are running the card at around two copies