Just a quick rules note: 609.3 If an effect attempts to do something impossible, it does only as much as possible
The win conditions are cards like Cavalier of Flame and Hallowed Spiritkeeper, and, by leveraging burn effects, sacrifice effects (to get token copies), and ways to double up like Roaming Throne, these win conditions are powerful and fun, while being off the beaten path
The threshold for Casualty only being 1 means you can sacrifice just about any other creature you control to filter 2 twice and put 2 cards into your hand
It allows you to look at and play the top card of your library at any time, and you pay life rather than pay the mana for spells you cast this way
For instance, textured foil Emrakul, the Aeons Torn, once valued at $132, now sells for around $40