Ovalchase Daredevil, Kheru Goldkeeper, and Prognostic Sphinx

Prerequisites

• Ovalchase Daredevil in the graveyard
• Kheru Goldkeeper on the battlefield
• Prognostic Sphinx on the battlefield

Steps

1. Cause an artifact to enter the battlefield under your control
2. Ovalchase Daredevil triggers, returning it from your graveyard to your hand
3. Kheru Goldkeeper triggers
4. Holding priority, activate Prognostic Sphinx by discarding Ovalchase Daredevil
5. Resolve the Kheru Goldkeeper trigger, creating a Treasure token
6. Repeat from step 2

Results

• Infinite colored mana
• Infinite self-discard triggers
• Infinite Treasure tokens