RMS Titanic, Muldrotha, the Gravetide, and Time Sieve

Prerequisites

• RMS Titanic on the battlefield
• Muldrotha, the Gravetide on the battlefield
• Time Sieve on the battlefield
• each turn available

Steps

1. Activate RMS Titanic's crew ability by tapping Muldrotha, causing RMS TItanic to become an artifact creature until end of turn
2. Deal combat damage to an opponent using RMS Titanic, triggering its ability, causing you to sacrifice it and create at least seven Treasure tokens
3. Activate Time Sieve by tapping it and sacrificing five Treasures, causing you to take an extra turn after this one
4. Cast RMS Titanic from your graveyard by paying
5. Repeat each turn

Results

• Infinite turns