Opponents control at least four artifacts and/or enchantments.
({4} magic symbol) available.
Steps
Activate Goblin Bombardment by sacrificing Dockside Extortionist, dealing 1 damage to any target.
Activate Soldevi Digger by paying ({2} magic symbol) , putting Dockside Extortionist from your graveyard on the bottom of your library.
Activate Grenzo by paying ({2} magic symbol) , putting Dockside Extortionist from the bottom of your library into your graveyard, and then onto the battlefield.
Dockside Extortionist enters the battlefield, creating at least four Treasure artifact tokens.
Activate four Treasures by tapping and sacrificing them, adding ({4} magic symbol) .
Repeat.
If opponents control at least five artifacts and/or enchantments, this combo nets infinite Treasure tokens and colored mana.