Ok all you need is a Duskmantle Guildmage and Jace, Memory Adept. You use the Guildmage's first ability two times. So tap 6 total mana and they lose 2 life for every card that hits their graveyard this turn. Next hit Jace's 0, "Target player takes the top ten cards from the top of their library to their graveyard." In which, they mill 10 cards and lose 20 life. 6 turn win, if they haven't gained any life.
Yup
Been around forever.
It creates a delayed trigger. Multiple activations create multiple delayed triggers.
I still like {Duskmantle Guildmage} and {Mindcrank} better.. Can be turn 5 if using {Invisible Stalker}