Opponents control at least five artifacts and/or enchantments.
({2} magic symbol) ({B} magic symbol) available.
Steps
Cast Saw in Half by paying ({2} magic symbol) ({B} magic symbol) , destroying Dockside Extortionist and creating two token copies of it with base power equal to half the destroyed creature's power and base toughness equal to half the destroyed creature's toughness, rounding up each time.
When the Dockside Extortionist tokens enter the battlefield, they trigger, creating at least ten Treasure artifact tokens.
Activate ten Treasure tokens by tapping and sacrificing them, adding ({6} magic symbol) ({B} magic symbol) ({B} magic symbol) ({G} magic symbol) ({G} magic symbol) .
When Timeless Witness enters the battlefield, it triggers, returning Saw in Half from your graveyard to your hand.
Cast Saw in Half by paying ({2} magic symbol) ({B} magic symbol) , destroying Timeless Witness and creating two token copies of it with base power equal to half the destroyed creature's power and base toughness equal to half the destroyed creature's toughness, rounding up each time.
When the Timeless Witness tokens enter the battlefield, it triggers, returning Timeless Witness and Saw in Half from your graveyard to your hand.
Repeat.
If opponents control six or more artifacts and/or enchantments, this combo nets infinite Treasure tokens and colored mana.