Opponents control at least five artifacts and/or enchantments.
Dockside Extortionist does not have a +1/+1 counter on it.
Steps
Activate Carrion Feeder by sacrificing Dockside Extortionist.
When Dockside Extortionist dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
When Dockside Extortionist enters the battlefield, it triggers, creating at least five Treasure artifact tokens.
Resolve the Carrion Feeder ability from step 1, putting a +1/+1 counter on it.
Activate five Treasures by tapping and sacrificing them, adding ({4} magic symbol) ({W} magic symbol) .
Activate Resourceful Defense by paying ({4} magic symbol) ({W} magic symbol) , moving all +1/+1 counters from Dockside Extortionist onto another permanent you control.
Repeat.
If opponents control six or more artifacts and/or enchantments, this combo nets infinite Treasure tokens and colored mana.