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
One look at a card like Sheoldred, the Apocalypse should tell you everything that you need to know about the evolution of black creature threats over the years
There are of course all those that can do based on the situation and scaling potential such as Torch of Defiance, Dack Fayden and even Ajani Goldmane
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)
One notable feature is the ability to export your MTGO collection directly to their website
Map Name: Karakas Color: Country Card Type: Legendary Country Card number: 240/249 Artist: Drew Baker Card Text: T: Add W to your manapool