This means it's not possible to cheat creatures into play out of nowhere (which madness can do), but it also means you're granted more flexibility, because you can cast a spell for its mayhem cost at any point during the turn in which it was discarded (rather than having to choose immediately as per madness rules)
Into the Norths a nice one if youre playing with snow lands, and Studious First-Year spots you a literal Rampant Growth on a body
One notable feature is the ability to export your MTGO collection directly to their website
Show and Tell is often used to put a mighty Eldrazi such as Emrakul, the Aeons Torn onto the battlefield, and in most games, that spells certain doom for the opponent
More to come - in the meantime, feel free to reach out below with specific questions
Approach of the Second Sun Approach of the Second Sun is my favorite control win condition, though its far from the objective best