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You don't need to attack with Cait Sith, Fortune Teller to gain the impulse card and free scry, but depending on the mana value of that top card, you may want to attack

Flying -- Flying is good too

This can help stall an opponent so the player can take full advantage and win, pull ahead, or come back in the game

You may play lands and cast spells with mana value 4 or greater from the top of your library

And while there wont be any preconstructed Commander decks, this will mark the return of Welcome Decks those are themed introductory decks typically given out by game stores for free so that new players can have a low-pressure way to learn the game