Piper Wright, Publick Reporter, and Time Sieve

Prerequisites

• Piper Wright, Publick Reporter on the battlefield
• Time Sieve on the battlefield
• An opponent cannot block Piper Wright
• Piper Wright has power 5 or greater

Steps

1. Deal combat damage to an opponent using Piper Wright
2. Piper Wright's first ability triggers, creating at least five Clue artifact tokens
3. Activate Time Sieve by tapping it and sacrificing five Clues
4. Piper Wright's second ability triggers five times, putting five +1/+1 counters on a creature you control
5. Resolve the Time Sieve ability, causing you to take an extra turn after this one
6. Repeat each turn

Results

• Infinite turns