Description Take on the ultimate challenge with Mewtwo
The rules specifically carve out that you cast it as part of that resolution, so you dont care about sorcery speed there: If you discard Emrakul, the World Anew at instant speed during your opponent's turn, you can cast it right then and there for its madness alternative cost
The additional text here is that it costs one mana less to cast for each creature card in your graveyard, and it can be as cheap as one Black mana
With copies of [c]Thoughtseize[/c], [c]Inquisition of Kozilek[/c], [c]Wrench Mind[/c], and more, it reduces the opponents hand to zero cards so that they cant play any threats
No, 'Geddon won't be in today's list, thank goodness, no worries