Soul of Windgrace, Waves of Aggression, Klauth, Unrivaled Ancient, and Dimir Aqueduct

Prerequisites

• Soul of Windgrace on the battlefield
• Waves of Aggression in the graveyard
• Klauth, Unrivaled Ancient on the battlefield
• Dimir Aqueduct in the graveyard

Steps

1. Declare Klauth and Soul of Windgrace as attackers
2. When they attack, Klauth and Soul of Windgrace trigger
3. Resolve the Klauth trigger, adding at least nine mana that you will not lose this turn as steps and phases end
4. Resolve the Soul of Windgrace trigger, returning Dimir Aqueduct from your graveyard to the battlefield tapped
5. When Dimir Aqueduct enters, it triggers, returning itself from the battlefield to your hand
6. In your next main phase, cast Waves of Aggression from your graveyard for its retrace cost by paying and discarding Dimir Aqueduct, causing you to untap all creatures that attacked this turn, and to get an additional combat and main phase after this one
7. Repeat

Results

• Infinite combat phases
• Infinite landfall triggers
• Infinite magecraft triggers
• Infinite self-discard triggers
• Infinite storm count
• Infinite untap of most creatures you control
• Infinite colored mana