Obeka, Splitter of Seconds, Time Sieve, and Replicating Ring

Prerequisites

• Obeka, Splitter of Seconds on the battlefield
• Time Sieve on the battlefield
• Replicating Ring on the battlefield

Steps

1. At the beginning of your upkeep, Replicating Ring triggers, putting a night counter on it
2. Then, if it has eight or more night counters, remove all of them and create eight Replicating Ring tokens
3. Deal combat damage using Obeka
4. Obeka triggers, causing you to get at least seven upkeep steps after this phase
5. Repeat step 1 for each of the additional upkeep steps
6. Activate Time Sieve by tapping it and sacrificing five Replicating Ring tokens, causing you to take an extra turn after this one
7. Repeat each turn

Results

• Infinite turns
• Lock