Capture of Jingzhou and Salvager of Secrets in hand.
({1} magic symbol) ({U} magic symbol) available plus enough mana to cast Capture of Jingzhou and Salvager of Secrets each turn.
Steps
Cast Capture of Jingzhou by paying its mana cost, causing you to take an extra turn after this one.
Cast Salvager of Secrets by paying its mana cost.
When Salvager of Secrets enters the battlefield, it triggers, returning Capture of Jingzhou from your graveyard to your hand.
Move to your next turn.
Activate Dour Port-Mage by paying ({1} magic symbol) ({U} magic symbol) and tapping it, returning Salvager of Secrets from the battlefield to your hand.
Dour Port-Mage triggers, causing you to draw a card.