This clever self-mill engine starts by using Sakashima of a Thousand Faces to copy Mirror-Mad Phantasm, completely bypassing the original creature's unique name while retaining its activated ability. Because your copy is named Sakashima of a Thousand Faces rather than Mirror-Mad Phantasm, activating that ability causes the game to search your library in vain for a matching name, inadvertently dumping your entire deck into your graveyard. This sets up massive graveyard-based strategies in formats like Commander, Legacy, Oathbreaker, and Vintage all in one fell swoop.