Dour Port-Mage + Eternal Witness + Notorious Throng Combo

Dour Port-Mage on the battlefield.

Eternal Witness and Notorious Throng in hand.

You control a Rogue that does not have summoning sickness and that cannot be blocked by an opponent.

each turn available

Deal combat damage to an opponent using a Rogue.

Cast Notorious Throng for its prowl cost by paying , causing you to take an extra turn after this one.

Cast Eternal Witness by paying its mana cost.

When Eternal Witness enters the battlefield, it triggers, returning Notorious Throng from your graveyard to your hand.

Move to your next turn.

Activate Dour Port-Mage by paying and tapping it, returning Eternal Witness from the battlefield to your hand.

Dour Port-Mage triggers, causing you to draw a card.

Repeat.

Infinite turns

Lock