Across the game, good strategy has shifted from who can find a way to set up the fastest, to who can dominate positioning on the board most effectively
This is because whenever a nonland permanent an opponent owns enters the battlefield under your control, that player loses life equal to its mana value
Also if you noticed the sapphire mox can be used with tolarian academy to generate even more mana, equaling more value in the deck
Duskmourn: House of Horror Commander (DSC) and Special Guests (SPG) are Commander-, Legacy-, and Vintage-legal sets, and individual cards are also legal where already available in other formats
This card can be a decent commander for sacrifice decks, but it can also fit right into the 99 of most Rakdos decks
I picked up Temporal Manipulation before it was legal